1Manufacturing Material: Made of high quality aluminum alloy material, it is strong and durable, which undoubtedly extends its service life. 2Simple Operation: It can convert any multi speed bicycle to single speed, easy to operate and easy to use. 3Spring Loaded Design: Spring loaded design, it has wide applicability, and suitable for a variety of gear sizes. 4Lightweight Design: Light weight, no extra burden on the bike, can replace old or damaged parts, thus improving the performance of the bicycle. 5Adjustable Chain Line: Adjustable chain line, can be adjusted to achieve chain tension, and can be adjusted according to demand. Item Type:BikeSingleSpeedChainTensioner Weight: Approx.94g / 3.3oz Material: Aluminum Alloy 1 x Bicycle Chain Tensioner