This single speed converter is suitable for bicycles used on mountainous terrain. The floating pulley and spring adjustment help achieve optimal chain tension. This bike chain tensioner is lightweight and easy to install. Made of high-quality aluminum alloy, it is durable and built to last. Ideal for cycling enthusiasts, this chain tensioner is crafted from aluminum alloy using CNC technology for improved strength and reduced weight. It features a hollow design, precise craftsmanship, anodized finish, and engraved logo to help prevent the chain from falling off and reduce chain noise.Type: Chain Tensioner Theme: Sports Features: Easy to Use Sports Type: Cycling Color: Black Material: Aluminum Alloy Size: 90 x 57 x 54 MM Package Contents: 2 x Bike Chain Tensioner Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm. Package includes only the items listed above; other items are not included.