This single-speed converter is very suitable for bicycles that fit in mountainous terrain. The floating pulley and spring adjustment can achieve perfect chain tension. This bicycle chain tensioner is easy to install. Made of high-quality aluminum alloy, this bicycle chain tensioner is suitable for people who like to cycle. This product is made of aluminum alloy material and processed with CNC technology. The product is and has improved strength. The hollow design, exquisite workmanship, anodized and engraved LOGO can prevent the chain from falling off and reduce the tooth feeling. Type: Chain Tensioner Theme: Sports Features: Easy to use Sport type: Cycling Color: black Material: Aluminum alloy Size: 90 x 57 x 54MM Package contents: 1 x Bicycle chain tensioner Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.