#### How to Use Pulleys for Speed Reduction | Sciencing

May 21, 2018· Velocity Ratio, Output Speed and Torque. Basically the speed of the output pulley becomes the input speed for the next stage, and you can find the multipulley drive. If the input speed is 75 rpm, the output speed equals 75 rpm divided by 3 or 25 rpm. In turn, one can find the output torque from the driver pulley to the driven pulley by multiplying the input torque by the velocity ratio.