Very economical and reliable method of speed change

Allows the user to find the ideal speed without changing sheaves and belts; especially important on applications where final driven speed is critical and difficult to attain with two fixed-diameter sheave

Speed range within the ratio is infinite, and speed change is accomplished quickly, while the drive is running

Can be used as a highly efficient belt tensioner, with no adjustment necessary

Offers a form of “soft start,” eliminating belt slip and premature wear

On belt drives with inherent high torque start-up requirements