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

9/10/11 For speed Material: CNC cutting 7075 aluminum alloy Bearing: stainless steel Compatibility: SHIMANO, CAMPAGNOLO, SRAM 9/10/11 speed derailleur (Not compatible with SRAM guide pulley.) Smooth rotation with ball bearings. It is more rigid than a resin pulley and does not release power. Ideal for upgrading bush type derailleurs installed on up to middle grade derailleurs. Can be used for both guide pulley (upper side) and tension pulley (lower side). For the number of teeth, we recommend the size that comes standard with the derailleur. *After installation, please be sure to check the shifting operation on an adjustment stand before riding. If the derailleur hanger is bent, the chain may come off and damage the frame or rear derailleur.