Mountain Bike Gear Ratio Calculator

How to calculate bicycle gear ratio.

Mountain bike gear ratio calculator. Shows table of all possible chainring sprocket combinations with gear ratio. Gear inches wheel diameter in inches number of teeth in front chainring number of teeth in rear sprocket. For a mountain bike off road a top pedaling speed in the low 20s is usually more than enough. 1 25 1 5 1 75 1 95 2 00 2 10 2 125 2 20 2 25 2 30 2 35 2 40 â ƒother in.

A sram 10 42 cassette has a very similar gear range but with a 32t chainring the lowest gear has a ratio of 32 42 0 762 and the highest gear has a ratio of 32 10 3 200. Bicycle gear size and cadence speed calculator wheel size. Ratio of the highest gear of your setup. The original calculator page is here.

Development the distance in inches your wheel travels for one revolution of the pedals in any particular gear. 0 20 mm 23 25 28 32 35 38 44 50 56 1 00 in. Colors group similar values. I ll calculate the best chainring cog combinations and skid patches for your speed and cadence and what your speed will be at various cadences.

20 24 26 700c 27 650b 29 tyre dia. If you re using a schlumpf drive plus an internal gear rear hub you should enter the actual number of teeth of the front chainring for the first chainring and this number of teeth times the schlumpf ratio for the second chainring. If you know their numbers just input them below and we ll calculate it automatically for you. Ratio of the lowest gear of your setup.

Also shown is the change between gears in the cassette. Next look at the top speed available with your largest gear biggest gear inches and decide if this is fast enough. 3 is green 2 3 blue and below 2 red. Moving your mouse over the ratio will show speed you will achieve by pedaling at 100 rpm.

Simple just divide your rear cog size from your front chainring size. Add mm if required. If you had to change to 30t chainring on the sram drivetrain you would achieve similar gear ratios as the shimano xt of 30 42 0 714 and 30 10 3 000.