What is the speed ratio of the input to the output shaft?

The speed ratio of the input to the output shaft in a mechanical system, such as a gearbox, is defined as the ratio of the rotational speeds of the two shafts. It is typically expressed as a fraction or a ratio, such as 2:1, indicating that for every two rotations of the input shaft, the output shaft completes one rotation. This ratio is crucial for understanding how torque and speed are converted in mechanical systems. The speed ratio can be calculated by dividing the speed of the input shaft by the speed of the output shaft.