Kcnc Bicycle Lightweight Derailleur Parts with Built-in Bearings Jockey Wheel 10T Pulley 11S / 10S / 9S Red 304391

9/10/11 Quick useMaterial CNC cutting 7075 aluminum alloyBearing stainless steelConformity SHIMANO, CAMPAGNOLO, SRAM 9/10/11 speed derailleur (not compatible with SRAM guide pulleys.Smooth rotation with ball bearings.Compared to resin pulleys, it has higher rigidity and does not lose power.Ideal for upgrading bush-type derailleurs installed in derailleurs up to middle grade.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.1 piece After installation, be sure to check the shift operation on the adjustment table before boarding. If the derailleur hanger is bent, the chain may come off and the frame or rear derailleur may be damaged.