KCNC Bicycle Lightweight Bearing Derailleur Parts Jockey Wheel 11T Pulley Built-in

9/10/11 For speed Material: CNC machined 7075 aluminum alloy Bearings: Stainless steel Compatible with: SHIMANO, CAMPAGNOLO, SRAM 9/10/11-speed derailleurs (not compatible with SRAM guide pulleys). Ball bearings ensure smooth rotation. Compared to plastic pulleys, it is more rigid and does not lose power. Ideal for upgrading bushing derailleurs that are equipped on derailleurs up to mid-grade. Can be used for both guide pulleys (upper side) and tension pulleys (lower side). We recommend that you use the size of teeth that comes standard with your derailleur. *After installation, be sure to check the gear shifting operation on an adjustment stand before riding. If the derailleur hanger is bent, the chain may come off, which could result in damage to the frame or rear derailleur.