If you want to learn more about car gear ratios, you can download RC Car GearCalc and try using it.

There are three sections to this app:

1) The first section is the introduction. Here, you will learn the basics of what a gear ratio is and how it affects the performance of your car.

2) The second section contains six exercises that will help you to understand how a gear ratio works. Each of these exercises has four steps that you need to complete. The steps are very easy to follow. After completing each step, you will get a score based on how well you understood the instructions.

3) The third section of this app contains five exercises that will help you to understand how a gear ratio affects acceleration and speed. These exercises are very easy to complete.