Shimano Ultegra RD-R8000 Rear Derailleur Shimano has given the Ultegra 11spd an updated design that utilizes all the new features of the new dura Ace 9100 series at an affordable price. The Shimano Ultegra RD-R8000 Rear Derailleur uses Shimano's SHADOW RD low profile design, which reduces crash vulnerability while providing a sleek integrated appearance. There's two options available depending on the gear range you plan on using, for example the RD-SS covers 11-25T to 11-30T and the RD-GS covers 11-28T to 11-34T cassettes. Features Sleek integrated appearance New low-profile design SHIMANO SHADOW RD Race endurance Optimized slant angle Wide compatibility RD-SS covers: 11-25T to 11-30T RD-GS covers: 11-28T to 11-34T | Shimano | Ultegra Rd-R8000 11Sp Derailleur Gs Cage, 11 Speed, 34T Max