Shimano XT RD-M8130-SGS Linkglide Rear Derailleur Pulley Set Description: The XT RD-M8130-SGS Linkglide Rear Derailleur Pulley Set is a factory replacement set that consists of a tension and a guide pulley. Both of these pulleys feature 13 teeth, sealed bearings, and a plastic body that reduces the noise of the chain going through the derailleur. Features: Includes the guide pulley, tension pulley, and the bearing covers Guide Pulley Bolts and other hardware sold separately