Cyclanto

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Bicycle gear development calculator

Calculate gear ratio, metres travelled per pedal revolution and gear inches using your wheel measurement.

Enter your own wheel circumference in millimetres, measured by you or read from the tyre sidewall if explicitly provided. A tyre size or diameter is not a circumference.

Enter your values, then calculate.

Method and limitations

Gear ratio = chainring teeth ÷ sprocket teeth. Development in metres = wheel circumference in mm ÷ 1000 × ratio. Gear inches = circumference in mm ÷ π ÷ 25.4 × ratio. This is a geometric calculation; it does not account for tyre deformation or slip.

Sources

No external reference is documented for this calculation; its method and limitations are described above.