The Gear Ratio Calculator is an app that calculates gear ratios for the road bike and the MTB.

It is a free tool that allows you to choose a replacement part and see how it affects the gear ratio.

You can create a graph with a combination of 22 types of chain wheels, 39 types of sprockets, and 70 types of tires.

You can set the speed (km/h, mph, m/s) and cadence (rpm) values on the vertical and horizontal axes, respectively.

The result will be displayed on the graph.

The application helps you to choose a replacement part that will satisfy your needs.