Shimano Ultegra RD-R8050 Rear Derailleur Pulley Set Description: The Ultegra RD-R8050 Rear Derailleur Pulley Set is a factory replacement set that consists of a tension and a guide pulley. These pulleys feature 11 teeth, have a sealed bearing in the middle for low friction and less maintenance, and a plastic body that helps to reduce chain noise as well as wear and tear on the chain. Features: Includes the guide and tension pulleys and bearing covers Pulley Bolts and other hardware sold separately