Shimano DURA-ACE RD-R9250 12sp Pulley SetThe Shimano Dura Ace RD R9250 Pulley Set is the pinnacle of drivetrain efficiency, designed specifically for the R9200 series. These pulleys utilize precision sealed bearings in both the guide and tension positions to ensure your drivetrain remains friction free and smooth. As a genuine replacement part, this set restores the high performance shifting and quiet operation expected from a Dura Ace 12 speed electronic system. These pulleys are the