Sprocket Ratio Calculator

Enter the number of teeth in the driving sprocket and the number of teeth in the driven sprocket into the calculator to determine the sprocket ratio.

Sprocket Ratio Formula

The following formula is used to calculate a sprocket ratio.

SR = T1/T2

  • Where SR is the sprocket ratio
  • T1 is the number of teeth in the driving sprocket
  • T2 is the number of teeth in the driven sprocket

Sprocket Ratio Definition

What is a sprocket ratio? A sprocket ratio is a simple ratio of the number of teeth in the driving sprocket divided by the teeth in the driven sprocket.

Example Problem

How to calculate a sprocket ratio?

  1. First, determine the number of teeth in the driving sprocket.

    For this example, the driving sprocket has 75 teeth.

  2. Next, determine the number of teeth in the driven sprocket.

    For this example, the driven sprocket has 25 teeth.

  3. Finally, calculate the sprocket ratio using the formula.

    SR = T1/T2 = 75/25 = 3.0.

FAQ

What is the fastest sprocket ratio? The larger the sprocket ratio, the faster the drive shaft will spin that is connected to the driven sprocket. So, increasing the sprocket ratio will increase the speed of the vehicle.

sprocket ratio calculator
sprocket ratio formula