Sam Stoner Racing -- Gear Ratio Calc

Gear Ratio Calc

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Chain and sprocket gear ratio calculator

Axle
Engine
Chain Length
Gear Ratio
Tyre Circumference
in cm
RPM
Speed
(mph) Speed (kph)

This sprocket and chain calculator is just a guide

This sprocket ratio calculator can be used as a rough guide when using 219 pitch chains, add the number of teeth of the engine sprocket and the number of teeth of the rear sprocket plus 17 to give you the required length of the chain.
eg: engine sprocket 12 + rear sprocket 83 + 17 = 112

Sam Stoner Racing -- Gear Ratio Calc