1、Made of aluminium alloy, carbon fiber and ceramic, the guide wheel is solid and durable. 2、Effectively increase the chain power inertia and reduce chain friction. 3、Strengthen the safety of the rocker bracket structure. 4、Variable speed and fast speed. 5、This guide wheel can closely match the chain, reduce the lateral virtual position, shorten the shift response time and improve the shifting efficiency. Features: 1. Made of aluminium alloy, carbon fiber and ceramic, the guide wheel is solid and durable. 2. Effectively increase the chain power inertia and reduce chain friction. 3. Strengthen the safety of the rocker bracket structure. 4. Variable speed and fast speed. 5. Reduce the sound. 6. Smooth output riding efficiency. 7. Hill climbing and labor saving, effective cadence. 8. Use all-ceramic non-resistance Palin, reduce frictional power consumption. 9. This guide wheel can closely match the chain, reduce the lateral virtual position, shorten the shift response time and improve the shifting efficiency. Specifications: Material: Aluminium Alloy (Guide Wheel Body) + Carbon Fiber (Frame) + Ceramic (Bearing) Applicable Shifting System: for 5800/6800/7000/8000 etc. (for corresponding model) Options: 5800, 6800, 7000, 8000 Options: 5800 (Black), 6800 (Black & Red), 7000 (Black & Red), 8000 (Black) Specifications: 5800/6800 Models for up 17T down 17T, 7000/8000 Models for up 13T down 17T Weight: Approx. 106 g Packing List: 1 * Road Bike Guide Wheel