Variable Speed Pulley provide the reliable variable speed service you require. Speed range is infinitely variable within standard ratio limits. All of our variable speed pulleys are spring-loaded and color-coded to indicate spring pressure - easy to identify and use. They are engineered to offer an economical alternative for many applications that may not require the expense of AC/DC variable speed motors and drives. Simple belt tensioning adjustments allows for speed changes from 2.25:1 up to 2.8:1. Economical Lightweight Strong Quiet Infinite speed range - within pulley's ratio limits.