Kcnc bicycle lightweight Derailleur parts Ceramic bearing specifications Jockey wheel 11T pulley 11S/10S/9S gold 304400

9/10/11 For quick useMaterial CNC machined 7075 aluminum alloyBearingCeramicFits SHIMANO, CAMPAGNOLO, SRAM 9/10/11 speed derailleurs (Not compatible with SRAM guide pulleys.Ceramic bearings ensure smooth rotation and 20 higher durability.Compared to plastic pulleys, these pulleys are more rigid and do not let power escape.Ideal for upgrading bushing-type derailleurs equipped on derailleurs up to middle grade.Can be used for both guide pulley (upper side) and tension pulley (lower side).The recommended number of teeth is the size that comes standard with the derailleur.1 pc.After installation, please be sure to check the shifting operation on an adjustment table or the like before riding the bicycle. If the derailleur hanger is bent, the chain may come off and the frame or rear derailleur may be damaged.