Use this dirt bike gearing calculator to quickly and accurately determine your bike’s final drive ratio, estimate top speed at peak RPM, and calculate the ideal chain length. Whether you’re tweaking sprockets or optimizing your gearing setup, this tool helps riders improve performance and customize their ride with precise calculations for sprocket sizes, wheel diameter, and engine specs.
Final Gear Ratio Calculator
Use this tool to calculate your dirt bike’s final drive ratio, estimate top speed, and determine chain length based on key gear and wheel specs.
The number of teeth on the engine’s output/front sprocket. The number of teeth on the rear wheel sprocket. Diameter of the rear wheel to help estimate speed more accurately. The engine’s revolutions per minute when producing peak power. Maximum horsepower output of the engine. Total number of links in the drive chain, used for compatibility and fit.
