Sam Stoner Racing -- Gear Ratio Calc
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