Gear Ratios

There are a few different gear ratio tools available on the internet, such as charts similar to the one to the right. Note, charts vary depending on the wheel and tyre diametre.

One of the most comprehensive tools is the calculator on bmxultra. This calculator enables you to enter your tyre/wheel size along with your cog and sprocket teeth number to work it out, and compare.

For the really keen IPhone users, you can also purchase their app via itunes...