Chain Guide 31,8-35mm Lightweight Chain Guard Road Bike Hollow Design Description: Use ultra-light high-strength AL7075 aluminum alloy with high-quality CNC treatment. It can be used on the tube in the frame to effectively prevent the chain and chain from jumping. It must be small and light, as well as strong and durable, so we use solid aluminum alloy as a material with high hardness and long service life. Innovative hollow design, weight reducing, good anti-chain effect, used for single disc sprocket, makes driving smoother and easier. A more compatible, original frame made of pipe with a diameter of 35, which after installation can be converted to a diameter of 31,8. Specifications: Material: 7075 CNC Nylon aluminum alloy Specification: mount type φ35mm 31.8mm/E The package includes: 1 piece chain guide 4 pieces of pads 1 piece frame protector