1. Size: 35mm~ 31.8mm mount / E type mount 2. Material: 7075 aluminum alloy CNC; nylon 3. The seat tube clamps the chain guide to prevent the chain from falling from the upper side. It is made of aluminum alloy with high hardness and can be used for a long time 4. Installation is simple and fast 5. Suitable for mountain bike use, compact design, light weight, smooth surface without burrs
