SHIMANO GRX Di2 RD-RX817 Rear Derailleur 11-Speed Switch Lever Unit and Fixing Plate – Y3HT98060
This Switch Lever Unit can only be used with Shimano GRX Di2 RD-RX817 11-speed rear derailleurs.
Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.