Shimano GRX RD-RX810 Rear Derailleur Tension & Guide Pulley Set Description: This GRX RD-RX810 Rear Derailleur Tension & Guide Pulley Set is a factory replacement set that consists of a tension and a guide pulley. This pulley set features an asymmetrical design and a plastic body that reduces chain operation noise. Features: Includes guide and tension pulleys, covers, and the low-maintenance bushings Guide Pulley Bolts and other hardware sold separately Specifications: Compatibility: Shimano GRX RD-RX810 Rear Derailleur