Genuine Shimano replacement tension and guide pulley set for Ultegra and GRX RD-R8000, RD-R8050, RD-RX800, RD-RX805, and RD-RX812 rear derailleurs. These pulleys help keep your drivetrain smooth and friction-free, featuring precision sealed bearings. The set includes one tension pulley and one guide pulley. Compatibility: Ultegra RD-R8000, Ultegra Di2 RD-R8050. Colour: Black.