A tensioner pulley is a device that can be used to tighten the beltin the system of belts or chains and puleys.The system typically consist of anumber of wheels known as pulleys and a belt that is wound around them. In orderforthe belt(chain) to fit around the pulleys, some part of thesystem needs to be adjustable. One way to low for this type of adjustment is a tensioner pulle y, which can be either manual or automatic. Manualtensioners usually are pried into place or adjusted by turning a bolt, and automatic tensioners typically are spring-loaded.
Sanxin offers total 77 types tensioner pulleys,they can be applied for the most popular European cars.