Shimano Ultegra Shadow RD R8000 Rear Derailleur, this is the 11Spd (GS). Group: Ultegra. Gear rear: 11-speed. Teeth small sprocket: 11T. Teeth large sprocket: 28T. Teeth large sprocket: 34T. Compatible Chain: HG-EV 11-speed / HG-X 11-speed / KMC 11sp/ Wipperman 11sp/ Connex 11sp/ Sach 11sp.
