How to Replace Brake Pads on a Bike - Disc Brakes

Modem bikes are commonly disc brake designs either mechanical or hydraulic. The traditional simple rim brake designs have been around for decades long before disc now relatively allocated to cheep model line ups today.

Hydrologic are controlled by fluid in a master cylinder on the handle bars. When you apply the handle bar levers they push pistons in master cylinder. Fluid is compressed all the way down the cable lines pushing positions in the caliper pushing spring loaded pads onto the disc. When you release the handle bar lever the spring loaded pads part the disc. Hydraulic drum brake designs operate the same basic principle operating the drum shoes inside the drum.

Mechanical disc brakes like rim brakes are controlled by an inner wire cable inside the outer cable from the handle bars down to the caliper lever just like rim brake designs. The caliper lever compresses spring loaded pads clamping the disc.

An important detail with mechanical brakes there are two designs one of which is your bike. One arrangement one pad is fixed. It doesn't move. When you apply the handle bar brake levers they pull external caliber levers pulling the moving spring loaded pad to the disc. A flexing disc is pressed on to the stationary pad so both pads clamp it.

When you release the lever the spring tension pulls the pad away. The disc flexes away from the stationary pad. Bikes fitted with this arrangement braking power in bike reviews tend to be wanting. The other arrangement both brakes move compressing the disc.

An important detail in trouble shooting is the effect of weather exposure. There are bikes with drum brake designs that tend make theses brakes relatively weather proof. Never the less corrosion stiffness in exposed cables specially brake pad springs may have occurred. Corroded spring system can't move the pads away from the disk properly. One or both pads are inefficiently clearing of the disc.

Corroded inner cable and pad spring stiffness is often the cause of poor brake performance.
A good old fashioned going round freeing up the corrosion with a bit of light oil can do the trick.

Don't just pure anywhere. Look where you put it. Concentrate running down between the brake caliber lever (not between the brake pad gap) concentrating oiling the inner wire cables and spring system. Avoid the pads. It dries them out to hard and dry causing brake squealing problems. Worst case bad juddering. Anti-corrosion spray is tricky as it severely dries up pads. Not recommended. Pads don't need that. They should be left moist.

Replacing pads reassembly skill is by far the most important for getting anything running smoothly again. Make sure you know you can reassemble your brakes to a satisfactory running order. The best bet is is to study You tube tutorials. Type in your search engine keywords youtube park tool how to Replace Brake Pads on Bike Disc Brakes. This clip goes though step by step of every possible brake style you will recognize on your bike.

Poor braking performance is likely due corrosion cable and pad spring stiffness not moving the pads efficiently. A major sign needing replacement is neglect to a point obvious metal to metal scrapping coming from the wheel every time you apply the brakes.

Do it yourself (DIY) alternative to a workshop bike stand there is always the alternative bike upside resting on the seat and handle bars. A detail everything is upside down what would be the right way up in youtube clip videos is is upside down to your perspective. 

Choosing a computer

Retailer appliance stores offer a range of budget tablet, mini note books and laptops to choose from along side expensive laptops. Traditional hard drives are electromagnetic mechanical devices that have a reputation of being slow and temperamental. They are fast becoming obsolete in favor of more stable and faster sold state hard drive technology.

Solid state technology is essentially huge memory flash drive big enough to be a hard drive. While traditional hard drives are still available the technology are now down graded to fire sale model line ups available. If you observe a cheep one that looks expensive bond to be a traditional hard drive model.

Random Access Memory (RAM) is an important consideration as it is our real time processing memory. A single bit of memory is one byte. The standard metric system prefix k- killo- for a thousand, M- mega- for a million, G- Giga- for a billion and T- Terra- for a trillion bytes. About 4Gb of RAM with is adequate for real time word processing programs and school homework processing. Any more is just wasted.

When programs run short of the real time memory (rtm) computers borrow from hard drives. High memory demand programs such as HD, (High definition) video gaming and video editing and creation programs need a lot of rtm(RAM if you like) to spare, up to several gigabytes.

By comparison to solid state technology program with traditional hard drives are distracted by constantly borrowing memory from them has become known as slow and temperamental handling such programs . Choosing a computer is based on  memory rtm RAM  demands. If you are working with high memory demand programs the highest RAM available is the best bet.

Sold state hard drive technology is now favored by consumers and manufactures alike. Having no electromechanical parts rtm response is fast and stable. Eventually traditional had drives will be a thing of the past. The most expensive laptops and tablets are those with a maximum RAM and solid state hard drive memory.

Another important detail is the processing speed. 1 Hertz is the unite of 1 byte per second. Gighertz is considered the standard adequate minimum. High processing frequency and rtm of RAM avialble  can handle high memory drain programs without becoming temperamentally slow. Inadequate  rtm programs are distracted borrowing from the hard drive slowing them down.

Specifying your productivity information to sales personal can guide you to the computing power you only need.  4Gb, of RAM, a 100Gb of hard drive and a processing frequency of a GHz for minor memory drain programs such as basic word processing  and school homework projects is all the power you need.

By contrasts 16Gb or more of RAM, a few Terabyte solid state hare drive and up to 10Ghz of processing frequency that demand high rtm memory demand programs like home theater movie making projects, are available in these power solid state hard drive laptops.

A word of note. The portability of modern computers allows lots of flexibility transport carrying in shoulder bags including riding motorcycles and bicycles. Computers are faster and stable in dry whether conditions.

Most bags are not weather proof. Units are often not protected from damp moisture. In wet whether there is a constant dampness in the air that help keep performance down. Using the absorbent characteristics of paper towels in transport packing specially when using the computer to keep condensation to a minimum can help performance in wet whether transport. Exposed to the elements
in motor cycle and cycling transport use a whether proof transport system

The modern trend is mobile smart phone swipe and tap technology. Retailer stores include same lap top models that don't. What looks like only the click pad with no right and left pad buttons is actually a part of the latest trends avoiding the problem of grit settling down between the left and right clicking pads gaps getting into the electronics. The left and right clicking is available in the single pad. Separate left and right clicking pads are a thing of the past.

How to Replace Brake Pads on a Bike - Disc Brakes

Fixing bicycle wheel wobble problems

One of the major inconveniences of cycling is flat break downs. Why do I always get flats? What am I doing wrong? Flats occur when tires have gotten warn to a state of baldness or slick tires deigns (Minimal tread). Sudden and dramatic is a picked up piece of glass, tax, or a sliver or wire, anything the punctures though the lining of the tire. Sometimes only the valve just let go.

Specially electric commuters and road bikes have shifted away from the traditional skinny slick pursuit racing tires. They are considered as vantage style theses days. Balled have gotten to a stage the rubber has become thin they start to developed a trend of a persistently going down.

They tend to pick up a collection of tiny fragments embedding themselves in the thinning rubber. Depending on your luck, they can remain there for weeks without a problem. Then one day..........!

A few electric bikes are tubeless tires even some pursuit racing bikes. If your unfamiliar with theses doesn't mean they are solid. There air filled. Valves sit in the rim hole. They are inflated the same way as traditional inner tube tires. Flats are kept to a minimum by thick hides very wide, knobby and Lots of thick tread.

Any do it yourself (DIY) owner getting themselves mobile again need experience and skill with both tube and tubeless disconnecting any electrics to remove wheels, remove tires and inner tubes, find the cause of the puncture, patch it and reassemble running smoothly again.

Specially computer electric bikes tires and inner tubes have been developed as flat proof as possible specially tubeless tires. They are designed with a thick hides with deep tread patterns that even tacks can't penetrate.

Tubeless tires rely on a creamy air tight sealant inside the tire acting as a inner tube to keep theses tires sealed. If a tubeless tire lets you down it's often the sealant somewhere in the tire including old hole that has been compromised for some reason. Patching tubeless tires tend to be only temporary while patching holes in inner tubes can be permanent.

The other thing that can flatten tires including tubeless unlucky enough to pick up a large enough nail or old remains of vehicle crash sliver of old glass you have picked up embedded in the tire. Examining round the circumference sometimes come across evidence ran over some tar or sticky gum that stuck a glob of tiny stones and glass fragments.

Tiny pieces including stone chips pushed deeply hidden out of eye sight sight rubber of the of balding tires, where they can be overlooked. Hidden bodies left in any tire will keep puncturing the inner tube, time and time again. These have to be found and removed  before you do anything else.

I don't have to remind you of the dangers of picking out with a sharp poker while tires are fully inflated with tragic results. It is best done vacuum flat. A needle point poker is ideal getting at the suspect fragment. Blunt instruments tend to push the offending object deeper into the tire in an tempt to lever it out.

Those who are not prepared with a emergency repairer kit often found themselves caught out miles from anywhere. Bad luck forced to walk our bikes on a flat for miles. With the offending object still in the tire the odds of destroying the inner tube beyond reaper not to mention permanently damaging the tire is extremely high. The offending object must be found and removed before you move on.
One of the tricks experienced cyclists do with tubules tires getting themselves mobile on the side of the road is always carrying a spare inner tube and tools to do the job.

They scan closely every inch for offending objects microscope scrutiny. Large objects are quickly fond. If not concentrate scanning for tiny slivers of glass and stones. Flick them out out with a poker before you start repeating.

Many Owners who spend all their time on the road have learnt form experience to carry an emergency inner tube or tubeless tire repair kit including a spare inner tube and all the necessary tools to remove the wheels, and most important of all pump. Even a spare inner tube. You can patch the old one when you get home used as a spare for next time. They often save cyclists.

Once you have removed any possibility of any suspicious fragments in tubeless or tube tires you can proceed to remove the wheel tire and inner tube. Your next job is to search for the the hole     .

If the wheel, tire and inner tub are removed turning your attention to inside the tire can be reveling. The inside fabric is good contrast allowing easy spotting. Once found, it is a simple mater of pushing out from the inside ideal avoiding the risk of the probe leveraging from the outside puncturing the inner tube.

With experience replacing a inner tube in a tubeless tire can be done. An important detail is to remove the tubeless tire valve core first. Keep it in a safe place you you can put your hands on it straight away for latter. You may need to wipe up the residual remains of the old sealant inside tubeless tires. Replace the inner tub valve feeding in the rest of the inner tube.

Inner tube patch failures are frustrating. It is often a sign of over looking a hidden pin hole when given up because you couldn't find anything in the tire or inner tube hole. You have overlooked a tiny sliver of glass or stone.

Another sign a possible leaking patch. The surface of the tube was not properly prepared and the cement not fully covered all the patch properly. Air is easily escaping out the edges.

Pin holes are so tiny they hide themselves like tires are notoriously hard to find. They are very tricky needing clever tricks to find these. If in a hurry microscope scanning slows you right down.

The only thing you can do is to pump up the inner tube to help expand the pin hole enough eventually catching a feel of a column of escaping air. Another sign repair failure is damage beyond reaper done to inner tube and tire walking or worse riding the bike for several miles on the flat tire.

Electric bikes tires are fat and some e-bikes tubeless. Tubeless tires have an air tight. Don't disregard as they are essential part of tubeless tires. Check the tire let down is due to a rubber seal leak in the valve. Wet whether exposure can detiarrate seals. Experienced cyclists prepared carry a spare tubeless tire valve as part of their kits.

A detail of tubeless tires is in the edge of the rim. Inner tube rims have a hook edge. Tubeless rims are flat. It is a mistake to fit a tubeless tire on a inner tube rim. And vice versa a tube tire on a tubeless tire rim. The tire rim beads don't seat properly. When fitting a new tire make sure the rim is hooked for the tube rim and the rim flat for the tubeless rim tire. Or make sure the tire is hooked for the tube rim and flat for the tubeless rim.

Quickly objects are big enough to leave a deep cut in both tubeless and tube tires. Plugging tubeless tire cuts is a bit of an art. They tend to big for permanent repaired. Warn out tubeless tires expanding the cut tubeless tire sealant has problems holding the cut together.

Warn out inner tube tires fatigue expands into a bump in the middle of the circumference by air pressure by the inner tube. Inner tubs are often seen in the bump creating a bumping hop when riding.

Old tires like these need a new or good tire replacement. For patching big cuts in tubeless tire cut details can be checked out entering keywords in your search engine filed bar youtube fixing bike tubeless tire.

Back to inner tubes if you have access to a sink or bath tub, no pin hole can ever escape an under whiter check. On the side of the road there is nothing you can do but persevere with expanding the inner tube full of air. The pin hole will be eventually be found. Provided you haven't walked you bike on a flat for a distance there will be no damage done to the tire and inner tube. Repair should be straight forward

Patches tend to hold fast compressing dips in the inner tube at that point. Tires don't balance leaving uneven pressure on the tire. The patch makes the a week inner tube pressure point where the rest of the tube takes the pressure resulting uneven inner tube pressure transferred to the tire.

Tire rims that look like they are not seat properly on the steel rim have been damaged either by scraping curbs but most of all a too tight tire fitting on the rim. Observing the tire rim seating of new and good bikes is a good guide of what things should be. The tire rim is a perfect circle running parallel with the entire circumference of the steel rim in perfect symmetry.

Too tight tires or even loose to get off and on is a sign of wrong tire size. Look for distorted and uneven circling of the tire. The tire rim can look as if it is not going to hold on for long in some places. Severe damage is likely caused by someone forcing a too tight tire off and on the steel rim with damaging levers ripping and tearing at the steel wire of the tire's rim. Too loose causes the same results. Things are made worse by uneven inner tube pressures.

Rider weight compresses soft tires and inner tubes specially loose a loose fit wrong tire size. Any added uneven inner tube pressure It stresses the walls of the tire rim bulge points. There will be potential further tire wall damage being done to the wrong tire size already week tire rim bulge.

The right tire size tire and inner tubes evenly distribute the pressure firmly and  evenly keeping the walls of the tires full. Right size tires pump hard and full not only makes riding feel solid and sturdy, but also reduces road paddle resistance in pedaling.

Constantly swapping with different tires, can lead to these kind of tire problems. The next time you have the tire off ( or access to any bicycle rim ) observe the inside edges of the tire and wheel rims. Most of us are unaware there is either a hooked or flat on the edge to bicycle rims. Correspondingly there should be a matching hook or flat design in the rim of the tire with the rim rim.

Looking at tire rims you will find 2 types a hook or a flat edge. If you assemble a hooked tire on a flat edged rim the tire doesn't sit properly. There will be tire damage issues transferred to the inner tube too as well. So too, a flat edge tire rim assembled on a hooked rim is a miss match fit. Hook or flat rims need proper corresponding hooked or flat rim edge matting. If the rim is hooked the tire rim must be hooked. If the rim is flat rimed the tire needs to be flat rimed.

Other causes ignoring arrows pointing in the drive direction when refitting. Pointing the opposite drive direction for both rear and front wheel, there will be tire damage issues transferred to the inner tube as well.

Bikes are best upside down resting on the seat and handle bars turning the wheel. Observe if there is any arrow on the tire wall. Turning the wheel in the drive direction note the arrow pointing direction.

If a well warn and smooth tire at this point you can check round the circumference of the tire to see if an offending object can found out side the tire assessment.

Having a good inner tube on hand will get you going as quickly the time it takes to replace it. Otherwise salvaged with a patchy reaper kit. If at a petrol station you're lucky with the handy free air pump station.

If on the side of the road you will need a hand pump. Pumping up the inner tube out of the tire will reveal If a previous patch is leaking. Inflating the inner tube you will soon feel a column of air from the patch or an expanded hole air leak giving itself away. If a leaking patch is not holding fast any more. Sometimes we can't find the holes this way.

This is cause by a tiny hole caused by a tiny overlooked peace of stone or glass chip. The pin holes they cause are notorious to find. The only way to find these holes on the side of the road is to supper inflate the inner tube with a hand pump to help expand the hole enough to feel air escaping. The worst thing with tiny pin holes air often escapes faster than you can supper inflate.

If you have access to a tube of water no hole can escape the under water test. Otherwise forced to do the best you can where you are. Keep expanding the inner tube feeling round the circumference for a column of air. It is often a help to stretch pulling and tugging the inner tube as you inflate to encourage the pin hole to open enough to feel the column of air.

A sign of leaking patches the surface of the inner tube wasn't properly prepared that can easily be ripped off. Patches that can't is the way they should be. Properly prepared inner tube surface you should never be able to tear off. If it does is your flatting source you can to tear off and start over with proper cleaning up again. If you don't clean off the reaming cement residue the patch will always have the same problem.

Tearing off there will be mess of reaming cement left. Applying new cement straight over it is the cause patch repair failure. This residue must be cleaned off.

Using fine engineering emery paper just won't cut it with out a lot of time and effort. To fine and time consuming. You will need coarse carpenter's sand pepper or the the cheese grater scraper provided in your patchy kit. If you don't scrape off the remaining comment the new cement will never hold. Scrape all of it away the whole area the new patch.

If a patch is not a concern you can pay attention on finding the hole in the tube with the pump. In the case of a budget hand pumps making no headway, depending whether you are left or right handed, you may need to stretch out the rubber of the as you pump to encourage the pin hole to expand.

One of the sign of a poor hand pump is previous under water tests finding pin holes when the pump has gotten wet and amerced in the water. This is a mistake because the wet rots the rubber seals causing no air sealing rendering the pump useless. When dealing with under water tests don't get the pump wet or you will be faced with a useless pump.

When you feel a column of air you have located the hole. Well warm and sooth baled tires that collect tiny slivers of stone and glass chips causing theses pin holes are extremely easy to loose site of. So it is prudent while you have the chance stretch the inner tube rubber so the hole is manageable. Once lost relocating them is difficult to find again. You can apply circling the pin in the center of a circle spot with a ball point pen.

Prepare the surface of the inner tube with cause carpenters sand paper or the cheese grater like scrapper provided with the patchy kit. If you don't scrape a cause clean area round the hole the size of the patch, the cement won't hold, otherwise air will leak from the edges another patch repair failure.
If you scrape the area bigger than the patch you're covering your bases the edges of the patch properly. As you scrape you will observe it often hides the hole. This is where the pen circle cones in handy before you started scrapping. When scraped bigger then the edges of the patch patches tend to be sturdy standing up the rigors of tire pressure for a long time.

If you're using a brand new kit, unscrew the cap. In the top is a little pin. Turn over and pierce the silver seal. Don't empty the container or you will end up a messy glob. Don't squeeze it. Let a drop out to a small glob right on the whole. Replace the cap.

Stretch the hole wide to let some of the cement drain into it and let close to help the cement plug it. When spreading the cement spread larger than the patch covering your bases the cement is clean or particles, grease and dirt contaminates the cement. Even dry clean fingers still can leave residue oily finger grease. Be careful with seating on hot summer days.

Make sure you allow the cement to dry sticky covering well the area of the patch. As you apply the cement you will observe it tends to hide the hole. Patches stick best when applied when the cement is tacky. Now you can tear off the silver backing of the patch.

It is not really necessary, but a helpful option covering you're bases for leak free edges to spread some cement on the underside of the patch itself spreading to the edges. Let dry tacky.

You will observe spreading the cement hides the hole. Eye up the best you can a line of site the center of the pen circle marker ( or the hole itself, if you can see it ) to the center of the patch and press on. You will only have one shot the cement hiding the hole, as the cement will stick fast immediately.
Watch your eye angle coordination on the hidden hole squares the patch exactly centering it in the center of the patch. Use any round edge pressing down the edges. Don't concentrate so much on the center but round the edges of the patch.

If you have a spare inner tube, that is beyond reaper you can use it as a shoe inside well warn smooth tires. Cut off the valve. A patch can be used to cover the gapping hole. The spare helps to act as a buffer shoe between the inside roof of the tire and the ball of the inner tube the tire rides on. All this depends on if you have the right size tire or it will only make things worse and how badly thin the rubber or the tire has become still picking up tiny stone and glass chips. Never the less with the right size tire the shoe inner tube is a help.

Before you reassemble the tire don't forget about any direction of the drive arrow on the tire wall must correspond with the crank drive direction. Now the inner tube can be reassembled back into the tire and fit the tire the arrow pointing in the direction of free wheel or sprocket crank push direction.

You may have experienced a tight getting off or on tight tire. A proper scrapping the patch will be sturdy enough to pump up to the maximum tire pressure recommended on the tire wall of the tire. Pumped up to the maximum recommended tire pressure we feel a sturdy solid and easier ride.  Fitting an extra shoe might be difficult to get the tire back on tough.

Other than that, an expense inner tube has a extra thick hide making them puncture resistant. Expensive tires essentially the same lining the inside. The anti puncture compound built into expensive tires  is what makes them more expensive.

Choosing a bicycle that suite you best

Bikes are governed what you want from them. Looking for a bike to suit our needs we have  a wide choice of styles from pursuit road racers, adventure cruisers, city commuters, African roasters and standard commuter mountain bikes too competition mountain bikes. Personal luggage carrying demands specialized cargo carrying capacity.

Buying new, second hand, or just do it yourself (DIY) renovating getting old bikes ruining smoothly again or used as donor spare parts keeping you own bike running smoothly, there is a range of sizes.

Today's bike on the market offer short legged teenagers to lanky adult designs. Woman's commuters and the latest electric trends are available at any dealership. Electrics are fast becoming popular with urban commuters living in centers built on hills and personal leisure.

Electrics are defined by typical ladies step thought frame designs. Sports bikes are mountain bike styling top bars commonly slopping toward the seat post giving low profile sleekness. These come as bare bones short wheel base and mudguard less to most people a mountain bike commonly a standard comuter type. Manufacture trends turning then into sports designs is a clear example appealing to the young.

African roasters and custom kids bikes such as BMX and kids leisure cruiser designs throughout the ages. Sporty long wheelbase are cargo carrying capacity designs. Looking for vintage bikes the most popular are the unusual and rare one off designs that are very rare.

For those who constantly carry a lot of gear on the back wheel demand one of the most important details to be aware of is the rear wheel drop out design. Traditional racing and commuter maintain bike drop out slots are steeply angled. If you are loading your bike like a donkey they have weight bearing issues.

Do it yourself (DIY) mechanics experience a rear wheel problem after disturbing the wheel when it is necessary to remove such as fixing a flat replacing back into the bike. It is a mistake to rely on the tightening of the wheel nuts holding the axial aligned. with these dropp out designs

Resetting the alignment of the wheel is critical with these type of drop outs. We generate a considerable amount of side to side peddling wobble forces flexing the drop out slot transferred to the axial. The axial is often twising out of alignment even when we assure ourselves the wheel nuts should hold the axial straight in place.

The wheel gradually slips to one side in time as we ride often by the drive side specially when pulling hard. A sign is breaking spokes, wrapping rim and tire wear problems not to mention ride handling that feels less than smooth as it should be. The wheel is millimeters off center.
To most cyclists though their bike is just a method of getting from A to B where traditional racing and mountain bikes carrying nothing but a back pack is all they need and prefer where their stress on the rear wheel is less of a problem.

Once the rear wheel has been disturbed and replaced for any reason the traditional angle rear wheel drop slot designs loaded like a donkey results in a considerable amount of constant maintenance headache on the back wheel. There is a constant adjustment and modifying rear wheel repair compensation for the low mileage out of the bike. Peddling forces are constantly pulling the axle off set out of alignment dispute our self assurances tight wheel nuts should hold the axial fast. This also applies to loading of front wheels too.

A recent development are n shape drops outs that has none of these issues ideal for those who expect a lot hauling children or using a bike as a shopping hauler to personal gear. These are in the realm of cargo carrying capacity frames specially electrics. The n shape drop out holds the axial fast in place. The axial can't twist out of alignement. Because the axial can't slip n rear wheel drop bike frames get trouble free maintenance for high mileage.

The latest trends are long sports designs special purpose saddle bags and high profile stance complete with mudguards. Shopping for intended purpose whether carrying luggage, city commuting or bare bones sports bike frame check out the rear wheel drop out. If intending use like a donkey always check for the n shape rear wheel drop out. All electric bikes are this type to support the heavy electrical equipment.

The n shape prevents peddling twisting sliding. This design has become increasing common on sexier low slung and short wheelbase sports mountain bike frames often expressed as hybrids because they can be used as is sports to back packer luggage carrying tourist bike in the same bike. They are classed in the adventure bike category.

So long as any sports bike frame is a n shape drop out design you can fit carrier and saddle bags. These bikes come in the bare bones with no mudguards and carrier. Mudguards, carriers and saddle bags are optional extras.

An important detail about electric bikes electric motors and batteries are to heavy loads for traditional rim brakes. Electric bikes come with disc either mechanical cable or hydraulic. For the DIY maintenance and replacement pad are a challenge and expensive and adjustment time consuming and fiddly.

Choosing frame comfort is determined on the size and design. If too short or to long handle bar reach or to high  or to short we feel it in the riding performance and handling comfort in our thighs. Our knees feel to bunched up or to stretched effecting our peddling comfort. Look for length of the handle bar reach when seated as well hight.

Relative to bike restorers and do it yourself repairers common tape measures are ideal reference tool. Typically one side is metric and the flipside side in handy inches. Tape measures tell us an inch is near enough to 2 and a half centimeters. (or 25 millimeters if you like). Flip sides tell us 39 and a half inches equals a meter.

Tape measures illustrate bike size is in the tip to tip of any (diameter) of the tire telling us straight away the bike's size that used to be commonly British imperil inches. Today imperial inches is dropped in favor of international standardization favoring the standardized metric system. Tape measures read older bike tires from child's 12 inches (a foot), 15, 18, 24, 26, 27, and even 28 imperial inches across.

Flip sides gives the metric equalivalent. These various sizes are catered for all sorts of physical physiques from short legged boys and teens, to lanky athletes. You'll find tire size written anywhere on the tire wall close to the tire pressure.

700c types are the default adult metric bike size used today. 26 inch equalivalent are older bikes tires. They may look the same size as a 700c but comparing them 700c's  are slightly smaller than the 26 inches. To give an idea of size 75cm (or 750mm according to tape measures imperial inches equalivalent over 7 inches across) dead on three quarter meter.

The x marking is by the width of the tire decimal point in inches or centimeters. Tape measures will read skinny racing tires less than a couple of inches to about 20 to 30mm across and mountain bike tires up to 4cm wide. Mountain bike widths can be as wide as much 60mm (6cm). Measuring the inside diameter measures the diameter of the tire telling you the diameter of the rim. But the overall tip to tip of tires includes whole wheel size. We have a choice of tire widths. Choosing a bike observe the details of the tire width that appeals to you the most.

Bikes come in allsorts of gearing range from standard external gearing including Internal 3-speed hub single sprocket drives. Rare vintage back peddling breaking systems built into the hub rarer still with gears found with these back wheels. But it it's common rear wheels external clusters of 5,  6,  7, and even 8 sprockets either double or triple front chain wheel churning sets.

A bit of arithmetic on the number of front chain wheel churnings and rear gear sprockets tells us  the speed of any bike. For example lets take a double front chain wheel set with 5 rear sprockets. In this case two 5's is a 10 speed bike. If  6 rear sprockets two 6's is a 12 speed bike. If 7 rear sprockets, two 7's are 14 and so on. If 8 sprockets two 8's is a 16 speed.

What about 3 front chain wheel set? Same multiplication factor. In this case three, 5's, three,  6's, three, 7's  or 3 threes, to three 8's, make 15, 21, and 32 speed bikes respectively. Just one glance at the front chain wheel set and rear sprockets give the relative speed of every bike. The relative speed is on the gear lever indicator.

Notice the law of arithmetic allows us five 2's,  six, 2's, seven, 2's  and eight, 2's, and three 5's, three 6's, three  7's and  three, 8's respectively. We are dividing the known  speed of the bike by the number of rear sprockets. For example given 10 speed we dived 10 by 5 rear gives us the 2 front chain wheels. Also the known speed divided the the number off front chain wheels. A 32 speed fro example divided 32 speed divided by the 3 front Chain wheel sprockets gives us 8 rear sprockets respectively. Arithmetic can't lie you know.

With bicycle gearing there is no such thing as fractions remaining. Any sum that has no fractions remaining is called composites. It is impossible to have any fractions over. If we check the common children times table we find in the times table three, 5's and if we look in the times 5 table we find the same sum as five, 3's. It applies to every speed rating. We can 18 divide 3 equals 6 and 18 divide 600 equals 3 resistively, Mathematics can't lie you know. Bicycle gearing range makes ideal composites perfect constants. They don't come any better than that.

Studying wheel geometry is equally symmetrical. We can use new bikes (at lest good or new wheels) all bikes are suspended by the spokes supporting the whole bike and rider on their wheel hubs. If we study the spoke arrangement on the hub flanges we will observe alternating in and out spoke heads round the entire circumference of the hub flange. One in. The next one out. The next one in. The next one out, pattern all round the hub flange. Counting the total is one side pans out the same same number the opposite side the total number of spokes of the whole wheel.
 
For example counting 18 one side doubled is a total of 32 spokes. A total of 32 spokes divided in half equals 18 spoke holes each side of the hub.

Using a new bike as a model we will observe how the spoke heads are perfectly flushed all the way round each hub flange spoke holes. New bikes are the best way to determine what spoke heads of any bike should be. Flushed spoke heads are firmly in place. If not the left to right peddling forces of our peddling twisting forces to twist/bend right at the head snapping right at this point a common cause of nuisance braking spoke problems.

New bike wheels show how tight and flush spoke heads in the hub flange and under and over overlapping every spoke is what spokes of all bikes should be is what makes bike wheels so strong. The in and over each spoke pattern is symmetrical rolling that they support each other one at a time from flexing as the wheel rolls round.

Noting carefully the way spokes cross each spoke head. New bike wheels tell us the way the spoke cross every head should be with any bike wheel. Next you will note each spoke crosses in a entangled over and under each other each. Road pursuit racing bikes cross including the spoke head only 1 or 2 spokes. It is common 3 cross. Some times with added strength for cargo carrying capacity wheels a total of 40 spokes 4 cross wheels.

Note with new bike wheel if you trace a in spoke head of a spoke to the rim tracing the spoke to the rim counting 5 along tracing back down will be a correspond in or next in spoke head. The same pattern applies to the outward heads. This pattern repeats systematically every five spokes along in the rim in a perfect symmetrical pattern.

Our unconsciousness of time.

Some of us believe traveling away from earth time is different than on earth we express as space time. Others gravity, slows time, while others the extreme stress of high speed motion.

Albert Einstein's special theory of relativity predicts what happens to matter traveling on a light speed scale. Einstein's sequel the general theory predicts gravity slows time via the bending of space (the gravitational pull if you like). including the extreme stress of light speed. It predicts the bending of space into a deep well at at the bottom (or center if you like) of black holes (Called a singularity) stops time altogether.

But when it comes to the biology of our brain it plays time tricks on us. An example of this we all agree when we have a good nights sleep we don't quite remember when we dropped off. When we check the time we are all surprised how fast the hours went by since the last time we read the time. "Is it that time allready"

Despite the fact time seemed to speed up when fast asleep the hours didn't travel any faster than we are fully awake. To a good night's sleep time seems to go fast while in reality it stays at it's regular conscious pace at the same time.

The core difficulty in understanding Albert Einstein's special theory of relativity predicting there is no absolute and universal time harks to our fully awake alertness having a problem with the concept. Not to being fast asleep it isn't. It actually agrees. Time passes normally for a fully awake and alert person at the same time another person fast asleep time is passing quickly. It is a clear example of time passing between 2 people fast and normal pace at the same time.

We are all familiar with the ability to be unconscious (subconscious mind if you like) as a part of all of us. It is in our make up. We all agree time doesn't seem to exist in comas: at lest not consciously. The example of a sudden shock of approaching danger we realize we see our death coming we often experience a few seconds a significant amount of time. It is a tick played by the perception of time. Another clear example. We often experience anticipating a few digital seconds counting down a significant amount of time.

To illustrate this track every second of any wrist watch or clock for a whole minute. You can do this with your computer or phone clock seconds turned on. I bet that would be the longest minute you'll every sit though. Anticipating the last 15 seconds will appear to be the longest seconds of your life.

It is a part of us we experience our consciousness partially down after the shock of loud bang taking les than a few seconds to recover fully alertness from the huge adrenalin rush to subside. Another clear example of the vagaries of time to our brain sports commentators often win and loose our sports heroes in fractions of a second. We tend to dismiss seconds let a lone less than a second as nit picking. As tracking every second in a minute tells us less then a second can be a significant amount of time.

Light traveling in the zero resistance of out of space travels a distance of a 186 thousand miles by the time the second hand of any analogue wrist watch and clock moves every division including any digital second tick.

Turning on your computer or phone clock seconds shows just hao fast light travels. Every tick light had traveled a distance of a 186thousand miles. In kilometer terms every mile equals 1.609km. It is only a matter of entering in any caculator (Including your computer operating system or phone caculator) entyering light speed in miles per second times 1.609 converts to kilometers per second. The read out shows the distance light had traveled when you track every second of the whole minute.

For mph we know there is 60 seconds in a minute and 60 minutes in an hour. It is only a matter of 60 times 60, (witch is 60 squared). The read out shows the distance light had traveled by the time a 1 hour TV program. Times1.609 converts mph to Kmph.

There has been many reports of people claiming they experience momentarily alarm of being killed coming. Mere seconds seemed to stretch a long time. Being unharmed the shock of escaping death by a whisker can seem to last a few seconds to recover. During that time our fully awareness is slightly lowered.

Even in those few seconds our brain is experiencing time differently at the same at the same amount it normally travels at the same time.

The ability to become punctilious is rearly when our consciousnesses goes down. We can begin to wonder if we may be born permanently in a coma except for the fact our fully alert consciousness level active in the foreground.

When fully conscious our unconsciousness is not aware of it. It seems it lives in a world where all the rules of conscious reality of our environment's time doesn't exist. We only need to think of deep comas. Our conscious level is completely shut down while still being kept alive no doubt by the automated body functions that may be under the control of our unconscious level.

It is often many days pass until we come to. We experience drifting into consciousness only to member the last time remembering being fully conscious. Our conscious resumes at the time it went down picking up only what it knows were it left off. Fully conscious the first thing we want know is how long have we been under.  Fully alertness is on a different dimension then our unconscious level.

A clear example is a stasis condition. Take the famous 1930's fictional space hero Buck Rogers. There was an 80's TV series, Buck Rogers in the 25th Century starring Gaul Gerard. He played the part of an astronaut Buck Rogers accidentally frozen in time in a space module sprayed by liquid nitrogen orbiting the earth in his space craft. Frozen solid in the module the module drifted a round trip back to earth 500 years into the future.

When he was revived this 500 year period might as well be a 5 seconds ago as far as he was concerned. If you believe in stasis it's what tells us what happens to time to us. Stasis tells us time doesn't exist no matter how long.

Being fully alert tells us we are beings of the universe telling us we are a spiritual life force not of our bodies we live in. Time doesn't exist to us when it is down. It can be voluntarily shut down by hypnosis communicating with our unconscious on the same level. It will tell you it doesn't know anything about time. Awareness of time is alien to it as alien as time doesn't exist to our full alert level level.

Our unconscisness is contentiously monitoring and recoding the environment round us though our external five senses. We have remaining unconscious memories our consciousnesses is never aware of. Our consciousness is not aware of our unconsciousness any more than our unconsciousness is aware of being fully alert.

Our consciousness is often aware of an uncanny intuition moment (a sixth sense if you like ) we sometimes have we can't explain. There are untold documented stories about this sort of thing on Youtube. Gut instincts and initiation is our unconsciousness talking about whet it's perceiving to us from it's own dimension. Our consciousness has no idea where it comes from. To our fully alert point of view it is an uncanny thought processes that just happened. Initiation sixth sense always seen as something of a spiritual experience.

Time is the same whether fully alert or not. It just depends on the point of view of being in a coma to fully conscious. Time exists as both our unconscisness and consciousness reasoning levels at the same time..

Our doubles in parallel universes

The key to our doubles is the many worlds theory known as parallel universes or expressed as multiverses theory. The periodic table of the elements is the key. It tells us we are beings of the universe said to be made of stars created out of  the big bang that has supposed to have created the universe. To most of us the missing rows giving it's shape is nothing more than a confusing jumbled patch work of symbols.
The significance the shape is in the grouping of the elements. The elements are arranged in vertical column groups adjacent to horizontal row groupings. The vertical columns are the 1st, 2nd 3rd and 4th group and so on.
Contents guide books to the elements helpfully organize the table clearer and easier to follow earth metals, metals, non-metal, and gas and non gas in typical contents heading style.
.If you wish key words using your favorite search engine for web page guide the elements. Youtube has great value video guides. Useful keywords include youtube: atoms: what are atoms: atomic make up: guide to the periodic table: guide to the elements: shape of the periodic table: elements and so on including relative electromagnetic radiation clips.
The table of the elements expresses the elements in 3 main particles of the atom that make up the whole universe. The key to the many worlds theory. The atoms are all created in the heart of stars including the elements we recognize our bodies are made of. Our bodies includes the virtually weightless electrons typically seen as point particles that orbit on a light speed scale round a couple of much larger and heaver particles called protons. Protons are sandwiched between other particles right in the center called neutrons. In particle physics and chemistry the proton and neutron nucleus is what we are interest in.
The number of protons of each element is expressed as the atomic number. The virtually weightless electrons and the large protons and neutrons in the nuclei make up 99.99% of the weight of the entire atom expressed as the atomic mass. The table categorizes the elements in numerical order of the the atomic mass 1,2,3,4 and so on.
Understanding we are made of atoms our bodies made up of electrons and protons are said to be electrically charged. The tiny electrons are said to be negative while the large protons are positive make up the center of the atom. The protons are sandwich between electrically neutral neutrons. Thus the the electrical nature of the atom the nucleus is positively charged and the outer electron shells negatively charged.
Electrons are repelled by any negative charge. The force is so compelling they shoot away on a light speed scale. The nucleus is repelled by positive charges in theory isolated by the neutral neutrons from repelling the protons apart is how our bodies work our chemical hormones.
Electrons are attracted to the positive charges instantly attracted into orbit round the nucleus. In theory the negative charges should be isolated by the neutrons collapsing the electrons into the nucleus. According to quantum physics electrons cannot move past the inner most orbit, shell or energy level as the orbits are called.
You can explore our bodies chemistry studying the victim and minerals table listed on the vitamin and mineral bottles with respect to referring to guide on the elements. The periodic table tells us the number of protons and electrons of each individual element listed according to the bottle label.
All those minerals we are made of the 3 fundamental particles that make up the atoms of our bodies the same particles making up everything else in our world and the whole universe. In effect on a sub atomic level we are effectively electrons, and the protons and neutrons of the nucleus the same particles stars are made of. Vitamins are the catalysts triggers for the hormone chemical reactions particularly our digestive and immune systems.
Studying chemistry books describing the chemical reactions is studying the way our body hormones work. Chemistry books can be a bit technical for most of us to understand. The best books are encyclopedia guides to the elements. Reading the guide pages we are effectively getting down to the nitty-grity of our bodies. The minerals iron, sodium calcium, and potassium all appear in the table in mettle groups used by our body in the immune building and repair.
Our bodies are mostly pressurized bags of mostly water made up of hydrogen and oxygen atoms. expanding against the inward crush of the earth gravity holding us to the surface. We all breath the earth's atmosphere made up accentually those gases of water vapor made up of just the 3 basic particles of the atoms reacting with the minerals you see on the in the vitamin bottles. According to the table we are accentually on a sub atomic level (Quantum physics). On this level at lest we are electrically charged electrons, protons and neutrons. The table tells us the different combinations of electrons, protons and neutrons. Hydrogen for example is a gas so too helium and a few others. The familiar minerals listed in the vitamin and mineral bottle list are groups of metals we get from our food.
The trick to reading the table is the overlapping adjacent horizontal rows of each column. The names of each element is generally the first letter of each element. Several elements use different symbols. For example we learn iron in our blood stream is a highly magnetic metal element using the symbol fe for ferrous metal giving our blood the red color and along with nickel and cobalt highly magnetic in nature.
Particularly chemistry books all this information can be viewed in science books on atoms, web pages particular youtube on the internet. The top number is the atomic weight by the number of protons. We learn we are carbon based beings. The bottom number the number of periodic table tells us electrons carbons atoms have 6 protons and 6 neutrons. This is the normal stable state of the carbon atom.
However there are commonly carbon atoms exist as 7 or 8 protons that tend to make it highly unstable. The carbon atoms that make up our bodies is but one example. Any atom with extra protons than the normal are examples of isotopes. They are highly unstable extra protons examples susceptible to the electrical unlike attract law dragging the extra protons away from the atom leaving the normal stable state behind. The neutrons and protons are a nucleus racing away like nails flying to a magnet we call radiation.
Our bodies have a total number of electrons, protons and neutrons in every eleiment. Mathematics projects extra protons changes the atomic number. The 6 protons plus the 6 neutrons expresses 6 and 6 is 12 making a carbon 12 atom. 2 more make a carbon 13. Three extra neutrons is a carbon 14. Carbon 13 and 14 are isotopes of the stable carbon 12.
Isotopes of any atom in the table are unstable determining the characteristic radiation behavior. The creation of the unversed gave atoms the ability the extra protons instantly accelerate away at random from the atom and the atoms that make up our bodies is no exception.
When there is a group of two neutrons and two protons created is a new nucleus called an alpha particle. The two protons that make the nucleus is somewhat heavy so travels way-way bellow light speed, a mere 30 thousand kilometers per second. If we apply the math's on this pans out to a 108 thousand mph take off to maximum velocity. Alpha particles hasn't the momentum to pass to pass effectively though the air we breath. Ordinary paper can stop it. Any magnetic field such as a magnet can catch the positive protons deflecting then off at random any direction.
The same with Beta radiation. It has two negatively charged electrons with a negatively charged proton called a positron. Beta is smaller than alpha which means less mass to weigh it's velocity down meaning it is light has more momentum to travel further. It has the momentum force to pass though just about everything except Aluminum. The negative charge though a magnetic field deflects the radiation as respect to the positive charge of beta.
Gamma ray radiation is the energy of heat stripping all electrons away from atoms leaving only the nucleus vibrating on light speed scale. It is such a high frequency (wave lengths are billionths of a millimeter every second) of pure heat energy expressed as plasma. Temperatures can be as high as a few million digress. This plasma wave incinerates everything it touches in less than a second. lead tends to slow it down. If there is a massive enough stops reduces it temperature passing though completely.
The elements are arranged in the periodic table in ascending order of atomic number according to the overlapping metal alloys and gases. it's easy to find the name or symbol for an atom if you know the symbol of each element.
What is termed as shells refers to each orbit of the orbiting electrons. Chemistry books, including web pages including helfpull video clips from youtube tell us every element has a total number of electrons. protons and neutrons. Electrons occupy shells circling the protons and neutrons. There can be up to 2 electrons in the first shell, up to 8 in the second and up to 8 in the third.
Studying quantum physics tells us how electrons in our bodies behave on a sub atomic level how our bodies chemistry works. The study of quantum  physics tells us in 2 places at the same meaning they shear each others orbit at the same time. They appear and disappear randomly on a light speed scale from shell to shell at the same time. As we are made of electrons. protons and neutron nuclei studying the quantum physics rules we are studying ourselves. (At lest on a sub atomic level).
The smallest amount of matter, time and energy in the universe is a Planck constant one divided by ten forty-three times multiplied by six point, two, six two called a Planck constant. It is a zero point zero thirty-seven zeros, six, two, six, two  a total of a forty three decimal fraction. (Six point two, six, two times ten to the minus forty three respectively). If we multiply is a reciprocal that pans out to six, two, six, two  thirty nine zeros a total of a forty three digit number multiplied by ten to the minus forty three  equals one.
The popular internet search engine Goggle is a example of big number. It is one multiplied by ten a hundred times. (Ten to the 100 one with ninety nine zeroes). If we multiply Goggle by itself we get one with a ten thousand zero number.
 Our bodies atom are same particles emitted from the exhaust of motor vehicles, the earth's atmosphere we breath, the oceans of the world the forests and wild life, the sands of deserts to mountains. In fact everything on earth and the universe including stars. Us and the earth we live on is made of universe dust.
Quantum physics tell us our electrons has spin. Since we are made of electrons our body is no exception. Physicists suggest not the kind of spin of a spinning tops we think of. There is a moving three dimensional up, down, left and right including toward and away from us depth dimension to them. Quantum physics tells us when one of our bodies electron change direction is a signal for other electrons to do the opposite. On a quantum scale a Planck constant every second and if everywhere else in the whole universe at the same time too.
Our brain works by a constant electrical brain wave activity awake and asleep. When dreaming our conscious mind is on the same wavelength as our subconscious mind talking to our conscious mind like people talking to each other reveling a lot about ourselves in our sleep. It is also in talking to ourselves with our conscious thoughts. If we talk to ourselves about anything long enough our subconscious works hard to make it true. Quantum physics tells us our brain's (indeed our whole body) electrons are in constant quantum leap activity just as the rest of the universes electrons non stop including sleep were they activity is the most when dreaming.
A quantum leap is when our bodies electrons disappear and reappear at random a Planck length in a Planck frequency. Physicists tell us there is no limit to the distance each electron sees each others quantum leap signal including distances clear across the the other side of the universe.
What our body's electrons do in this part of the universe electrons clear across the other side of the also in constant quantum leap activity. The electrical impulse surging in our brain are nothing more than over trillions of electrons in a electrical current arcing from cell to cell on a light speed scale in our heads every second. When the action at a distance effect of electrons was first proposed Albert Einstein expressed the idea as an absurd spooky action at a distance nonsense violating the maximum speed of light law.
If the our body electrons are quantum leaping this part of the universe everything and everywhere all over the universe too. It's inevitable Goggles of copies popping into existence all over the universe every second.
Einstein had problems with the action at a distance hypotheses. He believed quantum physics was incomplete. Physicists are missing something. Quantum physicists insisted that is what their expediential evidence has found. That is the way atomic particles behave. They're working on it to find out more.
The consequence of the whole universe electrons constantly quantum leaping all random at the same time the whole universe has the effect of what electrons do in this part of the universe exists in parallel versions clear across the other side, an instant communication across several Goggle light years across the universe in less than a second. (Several times a 100 zeros).
According to string theory several Goggle alternative dimensions of our world exist. In effect our bodies electrons are entangled with every other electron of the whole universe. It is as if we are tied in physically with every electron.
Quantum physics tells us he consequence of string theory there is several Goggle doubles of ourselves in alternate dimensions at the same time as we exit in our alternate dimension of them.
One episode of the original TV series Star Trek particularly deep space nine spin off and the British TV series Doctor Who illustrated parallel universes doubles of ourselves.
Several episodes played out a double of the Doctor and traveling companion and the crew of Deep Space Nine including the TV crime series castle himself in a parallel universe reminds us the world is increasing aware of the science of quantum physics entanglement theory.
A pilot of a TV series called the sliders gathered together Mallory's university professor Maximilion  Atorio, Mallory's part time coworker Wade Wells and a washed out rhythm and Blues singer Rembrandt Brown accidentally swallowed up by Quinn Mallory's antigravity experiment  turned rouge portal to parallel realities. The polite laid out the plot the coordinates to get back home became corrupted trapping them in in endless series of sliding from world to word to the next in the hope they will find the right coordinate  back to their home prime reality.
Example of alternate worlds the group could have encountered is demonstrated in our own reality. Our reality at the time of the last ice age there were brotherhood species called Cro-Magnon men and Neanderthals now extinct that once lived along side humans us, penologists call homo sapiens.
We have seen many videos of Neanderthals and Cro-Magnon men. They look tough, and sturdy people typically stereotype of the rough hide graded cave men. Cro-Magnon men had brow ridges while Homo sapiens looked like today's modern western humans.
There was one important feature of homo Sapien mental capabilities that saved us from extinction was quick thinkers. Smart learners. We all have the inherited ability of planning ahead the other species lacked that was our savior. The other two species just lived from day to day from hunting to dally living. The didn't have the capability for boredom. Homo sapiens craved planning ahead, curiosity and entertainment to satisfy their mental needs.
In our reality at lest the quick thinking and curious humans craving clever planning all the time are the only species to survive. The slow thinking and lack of need for entertainment of the other species was their down fall. Quantum physics tells us string theory entanglement tells us different realities of alternative evolution outcomes.
Theoretical Goggle alternative option outcomes where human frailty was our down fall. Neanderthals, or Cro-Magnon men or both developed sufficient thinking strength instead that was their survival strength. There should be Goggle dimension of alternative Neanderthal, Cro-Magnon modern alternate dimension realities on earth with extinct humans. That's just one example of an alternate reality.
According to string theory there is up to ten dimensions at any given time. We are not aware of these dimensions any more than we are aware of anything when unconscious. Some physicists are compelled to speculate  theses dimensions define the many worlds theory. It tells us our bodies electrons should have parallel DNA doubles of ourselves in parallel reality dimensions.
Every possible circumstances and lucky chances from birth to death is supposed to be playing out right now in many Goggle Cro-Magnon men, Neanderthal or (as in our reality only humans) parallel dimensions to our world. As far as we are concerned our reality is only dominated by homo-sapiens but there could be many Goggle dimensions of only Cro-Magnon men or only Neanderthal or both or all three of us existing together right now.
In a homo-sapient dominated dimension history books of our world Hillier's life the way all the Hitler biographies tell it. In many dimensions Hitler's double's lives were very different not necessary a identical clone personality as each other at that. There are a Goggle of alternate scenarios we can come up with.
Alternative Ideas successful and talented Hitler artists instead of a tyrant we know in our world. Many dimensions can potentially have famous landmark buildings and structures that bears his signature and styling often bearing his of his name and many case all over the world instead of the bulling tyrant we know in only in our reality.
In the theory of many life outcomes to our personal time line history our doubles should be leading totally different lives than ours. Using Hillier as an example many scenarios point to totally different lives as a famous artist architect or some other profession in many Goggle alternatives. There is Goggle number of alternate ideas we can com up with.
There are a goggle of our lives some of us are single others are married with children, various careers others not famous and some us are, while others are drop out nobodies all living at the same point of now time.
To help show in a extreme example of the different lives of us doubles lead, an alternate Hitler to Einstein's family moved to America for a better life early in their lives. A Goggle of ideas part of the 1500 souls that went down with the Titanic in our reality those that died lived and those that lived died combination out of the total on board alternates.
There are a Goggle of alternate Julius Cesizer  Hitler to Einstein's.  A lot of Hitler's doubles weren't so lucky when he was a caporal in world war one.
There is little a known story an Australian sniper serving in the Western front. In this reality he had Hitter dead in the cross hairs of his rifle scope. His trigger finger relaxed off the trigger. If the sniper had been a killer Hitler would have been been a gone burger. However there is a goggle of alternate cases where a Goggle of snipers did confidently bump him off without a second thought.
A Goggle of sniper doubles got him. A Goggle of others missed. In many ways, fate can dish out a Goggle complex lucky and unlucky escapes in a Goggle of dimensions at the same time serving in the first world war. In other realities as far as the dimensions of the cosmos is concerned all the Hitler doubles were dead and alive at the same time.
It is the concept of a thought experiment thought up in this reality, by a German Physics called Schewdgener's cat that portrays a hypothetical Goggle odds of a Goggle of our doubles ( and when I say our doubles yes I do mean you and me ) are dead while others ( like us and our doubles ) are still alive in Goggle realities including you and me to this day. Schewdgener's cat principle is a part of quantum physics entanglement theory.
The term entanglement the means what it sounds in context. Me and you and all our Goggle doubles lives are all entangled together by our DNA in the reality dimensions of the cosmos.
Particles of the atom are identical clones throughout the entire universe, no matter were they are. Atoms of the sun are the same atoms in every other stare even clear across the other side of the universe. A clear idea liken to a dozen identical basket balls in one shop identical balls elsewhere all over the country. They are all the same no matter where they are.
Theoretically what an atom does this side of the universe there are cloned particles clear across the other side as well. All the characteristic behavior of every particle the entire universe is uniformly the same. What atoms do in this side of the galaxy atoms are equally working clear across the other side too.
This means odds of an action in this side of the universe has a similar chance of a similar effect the other side. The word  entanglement describes the entangled lives of the atoms of the universe including us and our doubles entangled with us.
Entanglement theory came about from a simple question. What if a person in our world changed our worlds history traveling back to world war one making sure Hitler was killed then returned to the present? What would happen to the timeline that already happened in the travelers memories? Where does all the historic events memories go if the events no longer exist more?
What if there was a time traveler that went back back in our realty past to make sure Hitler lives altering the time line. Theoretical in the world Goggle alternatives our time line can be changed time and time again. It suggests our time line is not fixed but variable. It can be changed to different time lines many Goggles over.
One scenario I can think of is liken to the analogy  of computer recovery reformatting hard drive back up system. If the manufacture bias system and operating stored is available recovery sequence is anything to go by, the system restore is accessing a stored copy of the original reinstalling the system back to where it was before.
In a similar way if there is a major error of our time line like a destruction of our past that wasn't supposed to happen a reboot kicks in resetting our original time at that point allowing the time to continue with what our time line was meant to be up to this day. For example if our reality Hitler is killed when not meant to happen a reformatting copy makes sure Hitler was not killed continuing on it was meant to be in our reality. In the mean time the change of events is set on course as a parallel reality to ours.
What prevents criminal terrorists time traveler interference? From our point of view of a visitor from the future already knows the past will have a different view point of the present we only know as the present. Imagine a person of the future in our present time hell bent in changing his point of view of his past altering our point of view of what we where meant to happen to us. From your point of view is changing our future of what you are going to supposed to have done changing our fate.
The view point of the person only knowing the present (that is us in the now time) as the visitors past point of view that haven't happened to us yet seem in parallel with each other
Operating on the principle we can imagine thousands of different outcomes for the Titanic. It missed the iceberg in a goggle of realities. A Goggle of worlds the politics at the turn of the twentieth century was different than ours as we know it so world war one couldn't break out. A Goggle of alternate worlds was no history of the Titanic what so every.
It has been proven (at lest in our reality) the Titanic was solidly built. Investigative teams found the Titanic was structurally sound. It has been concluded no ship could ever have survived that much sinking stress of the bow going down first compared to other ship disasters floundering and sinking in far better conditions.
In many Goggle worlds the sliders visited the Titanic may not have existed at all but on many other worlds they visited events leading up to the sinking had to have varied from world to world. The crew and passenger manifests and their doubles had to have varied from world to world too from different captains to crew members. The universes is a world where this world is just one of a Goggle of entangled dimensions in which ships don't exists and ships that exists at the same time.
In some worlds the sliders visited the Titanic could have easily barely squeezed close by in a close call sailing harmlessly on leaving a small foot note in those world liner histories. Many other alternate Titanic histories may have gone down were the water tight doors did their job keeping the ship afloat for days. Passengers safely rescued to other ships using the Titanic life boats ferried to other liners and merchant shipping that came to the rescue.
We can come up with a goggle of an alternate famous way for a famous ship to go. One example the sliders could easily have been in one world waiting for the timer to recharge to activate the portal. In a Hotel suite a TV documentary of the Titanic in Sydney Australia loading Anzac loading and  boarding the gang planks to Europe in world war one.