Spring loaded Automatic adjust Chain Tensioner
This engine drive cover attach Automatic Chain Tension feature is a great enhancement over the standard clamp to frame stay fixed idler.
With this spring-loaded tensioner means you might Never have to adjust chain tension again.
This auto tensioner has a Pulley with ball bearing operation same as the standard kit stationary bike frame chain stay model.
Keeps constant tension on your drive chain to overcome loose or stretched chains that will occur over time.
Attaches to the drive cover of any Chinese 2 stroke bicycle engine.