Gear Ratio & Sprocket Calculator
Calculate top speed per gear, see how sprocket swaps change your bike's performance, and dial in your gearing before you buy.
Sprocket swaps are one of the cheapest and most effective modifications you can make to a motorcycle. Going up one tooth on the rear sprocket softens acceleration and raises top speed; going down one tooth sharpens it. This motorcycle gear ratio calculator lets you model any sprocket combination and immediately see the effect on estimated top speed in every gear — before you spend a cent.
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About This Motorcycle Gear Ratio Calculator
This motorcycle gear ratio calculator helps riders understand how gearing changes translate to real-world speed. Enter your sprocket sizes, tyre profile, and gear ratios to instantly see your estimated top speed in every gear.
What Is Gear Ratio?
The overall gear ratio of a motorcycle is determined by dividing the rear sprocket teeth by the front sprocket teeth. A higher number means more torque multiplication and stronger acceleration; a lower number means higher top speed at the cost of low-end pull.
How Sprocket Changes Affect Speed
Adding one tooth to the rear sprocket (or removing one from the front) lowers your overall ratio, increasing acceleration but reducing top speed. Removing a rear tooth does the opposite. Small changes have a surprisingly noticeable effect, especially in lower gears.