Shimano Ultegra Rear Derailleur 11s RD-R8000Shimano Ultegra R8000 11 Speed Rear Derailleur Accurate mechanical shifting developed to provide the rider with the smooth and reliable shifting pattern across their entire cassette, slick changing across cassettes. The new Ultegra R8000 is adopted with the Shadow Technology inspired by Shimano's mountain bike derailleurs. This allows for a lower profile design and places the derailleur further inboard, keeping it out of potential risk of damage in a