Gear Ratio Calculator

Gear Ratio Calculator

Our Gear Ratio Calculator allows you to determine what your Top Speed will be given the maximum safe RPM of your motor, the number of teeth on the front and rear sprockets (aka the sprocket and chainring) and the diameter of your rear wheel (enter in Inches). That's the minimum of information that you'll need to use this calculator. You can also just type in your gear ratio if you already know what that is. Put the first number of your ratio in the Sprocket Teeth field and the second number in the Chainring Field.

Enter your vehicle information here:

Motor RPM  

Sprocket Teeth  

Chainring Teeth  

Wheel Diameter  


Your calculation:


G Ratio  

Top Speed  

75% Speed