RC Gearing Explained - What happens to Torque, Power and Speed

In this video we get a good understanding of how the RC gear ratio works. We answer questions such as what is the reason for a gear ratio? What does the gear ratio do to power, torque and RPM of the motor? And more!
A transmission in an RC vehicle is quite an important assembly. It allows the designer to better control the amount of speed and torque that gets transmitted from the motor to the output shaft. In an RC car this would of course be the wheels. Not only are gear ratios used in RC cars however, they are also used in RC Airplanes and RC Boats.
The RC gear ratio can easily be calculated. Simply take the driven gear number of teeth and divide it by the drive gear number of teeth. Although using the number of teeth is the preferred method for determining the gear ratio, it is entirely possible to calculate the gear ratio by using a diameter or circumference measurement.
The gearing that you use is also highly dependent on the type of driving (RC Car) that you will do. For example a high speed track would make for gearing that would allow high speeds. A tighter track with a lot more corners would be more suitable with a gear ratio that sacrifices speed for torque.