THE MOTORCYCLE TOOLBOX
Motorcycle calculators
Connect primary reduction, transmission gears and final drive.
Gear ratio
Combine motorcycle primary reduction, selected transmission gear and chain final drive to calculate overall reduction and theoretical road speed.
Open calculator
Sprocket comparison
Compare motorcycle sprocket changes with percentage differences in final reduction and fixed-RPM road speed, keeping primary and transmission ratios consistent.
Open calculatorChain length
Estimate motorcycle chain link count from pitch, sprocket teeth and center distance, with an even-link selection and a revised center-distance estimate.
Open calculator
RPM to MPH
Convert motorcycle engine RPM into MPH and KPH while accounting for primary reduction, selected transmission gear, final drive and tire circumference.
Open calculator