Motorcycle Tools
Free calculators that help when you choose parts and plan maintenance. Every tool shows the formula it uses and a worked example, so you can check the result yourself.
Sprocket Gear Ratio Calculator
Calculates the final drive ratio from sprocket teeth, the speed and rpm effect of a sprocket change, and the theoretical speed at a given rpm.
Open toolMotorcycle Tyre Size Calculator
Calculates overall diameter and circumference from a tyre size and the speedometer error between two tyres.
Open toolChain Length (Link Count) Calculator
Calculates the number of chain links needed from sprocket teeth and centre distance, and the resulting axle position.
Open toolMotorcycle Fuel Consumption Calculator
Calculates L/100 km, km/L, mpg, cost per km, tank range and trip cost from distance and fuel used.
Open toolMotorcycle Service Interval Calculator
Works out when oil, filters, spark plug, chain, brakes and CVT belt are next due from current mileage and the last service, using general intervals.
Open toolMotorcycle Tyre Pressure Guide
General front/rear tyre pressure ranges (bar/psi) by motorcycle class, with a bar–psi–kPa converter.
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How these tools are built
The calculations use standard engineering formulas (gear ratio, tyre geometry, chain length). Service and tyre pressure values summarise typical ranges from common manufacturer manuals; your motorcycle's own owner's manual always takes priority.
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