Tensioners are belt tensioners used in automotive drivetrains. The structure tensioner is mainly composed of a fixed casing, a tensioning arm, a wheel body, a torsion spring, a rolling bearing and a spring bushing, etc. It can automatically adjust the tensioning force according to the different tightness of the belt, making the transmission system stable, safe and reliable. Our Advantages of the tensioner pulley : 1. we are the bearing manufacturer,the most competive price and high  quality. 2. Perfect group of technical engineers give you the best support. 3.Well-trained group of international sales provide the best service. 4.Our brand(VSPZ) aviliable and brand  customization service. 5.Rich stock and quick delivery.