THE MINI BIKE TOOLBOX
Mini bike calculators
Understand compact drivetrains, chain reductions and wheel speed.
Gear ratio
Calculate a mini bike’s total reduction with sprockets, optional jackshaft stages and a selected converter ratio. Estimate wheel speed from engine RPM.
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Mini bike speed
Estimate theoretical mini bike speed in MPH and KPH using engine RPM, overall gearing and tire diameter. Compare gearing without assuming the engine can pull it.
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Sprocket comparison
Compare mini bike rear-sprocket changes and their effect on reduction, wheel torque multiplication and theoretical road speed at fixed engine RPM.
Open calculatorJackshaft gearing
Calculate the combined reduction of a two-chain mini bike jackshaft drive and see how both sprocket pairs determine theoretical speed.
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