High-performance ceramic bearing for smooth and quiet operation. and carbon fiber pulley wheel for enhanced performance. This derailleur is compatible with a wide range of components, For 8000,8020,8050,8070,8170,9100,9150,9170, making it a versatile choice for cyclists. Essential rear derailleur for proper shifting and chain management. Includes reinforced carbon fiber for higher stability. The UT Bicycle Rear Derailleur features advanced ceramic bearings that a smooth and quiet ride, enhancing your cycling experience. Its carbon fiber pulley wheel is not only but also , providing a high-performance experience. This derailleur is compatible with a wide range of components, For 8000,8020,8050,8070,8170,9100,9150,9170, making it a versatile choice for cyclists. It plays a crucial role in ensuring proper shifting and chain management, essential for any bicycle. Product Information: Large Carbon Fiber Pulley Dimensions: 142x88x14mm Material: Carbon Fiber Bearing Material: Ceramic Bottom Bracket Gear Teeth: 13T-18T Color: Black Package Contents: 1* UT Bicycle Ceramic Bearing Only the above package content, other products are not included. Note: Light reflection 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 +/- 1-3cm.