Steering Ratio = Steering Wheel Rotation / Wheel Rotation
Given:
One complete revolution of the steering wheel = 360 degrees
Rotation of the wheels for one complete revolution of the steering wheel = 20 degrees
Steering Ratio = 360 degrees / 20 degrees
Steering Ratio = 18
Therefore, the steering ratio is 18:1. This means that for every complete revolution of the steering wheel, the wheels will turn 18 times.