Bicycle Wheel Sizes For Computer

By comparing this dimension you can see if the brakes will reach when a different size of rim is fitted to your bike.

Bicycle wheel sizes for computer. The bead radius corresponds with the distance from the centre of the wheel to the centre of a brake block. A bicycle computer can be used on an electric scooter or go kart if the correct wheel size is programmed into it. Generic bike computer wheel size calculator. Wheels with an iso diameter of 584 mm were originally known as 650b and were first introduced on french touring bikes in the 1960s.

Bicycle computer calibration numbers file formatted for printing. It will automatically calculate the estimated circumference in mm used by most new cycle. These figures are useful for setting your cycle computer and precisely calculating gears. Etrto tire size l mm l cm inch 47 203 12x1 75 935 94 54 203 12x1 95 940 94 12 40 254 14x1 50 1020 102 14 47 254 14x1 75 1055 106 40 305 16x1 50 1185 119 47 305 16x1 75 1195 120 16 54 305 16x2 00 1245 125 28 349 16x1 1 8 1290 129 37 349 16x1 3 8 1300 130 32 369 17x1 1 4 369 1340 134 40 355 18x1 50 1340 134 47 355 18x1 75 1350 135 18 32 406 20x1 25 1450 145.

One thing that makes bicycle wheel sizes notoriously confusing is the use of different names for the same size. Another article serves up some history of distance measurement on bicycles and the limitations on its accuracy. Half of the bead diameter i e. When you re done using this page check out my new bicycle gear ratio comparison page.

The computer needs to know the tire size so that it can accurately translate tire revolutions into ride statistics such as mph or kph and distance traveled. Being slightly smaller than modern road bike wheels their use persisted on small and extra small road frames that couldn t accommodate a 700c wheel. Most bicycle computer instruction manuals only list wheel size input numbers for 16 and larger wheels however bicycle computers can be used with wheels smaller than 16 if the correct wheel size is programmed into the computer using the calculator above. Switching from 630 to 622 for example needs another 4mm of brake reach.

Your bike computer should have a way to do calibrations the old fashioned way by rolling the bike a known distance typically something like 10 meters after mounting the magnet sensor and from this it will calculate the necessary parameters for the wheel size. In some cases you might not have complete data or you desire near perfect accuracy. To use the calculator below select a wheel and tire size from the table or enter the wheel and tire size in mm in the dia. Calibration from a.

This works for all brands and all wheel size. Generally you can look to your tire s sidewall to locate its size match this number usually something like 700 x 23 or 26 x 2 0 to a code in your bike computer s owner s manual and follow these instructions to enter the code into the computer.