Shimano Ultegra Di2 RD-R8150 12 Speed Rear Derailleur (Black) Return-Yes introducing the new Muc-Off X-3

introducing the new Muc-Off X-3 Dirty Chain Machine

stainless steel body plates help reduce flex

constructed from lightweight and durable aluminum alloy

Disc Brake

With the face of the bearing visible

Shimano Ultegra Di2 RD-R8150 12 Speed Rear Derailleur (Black) Return-Yes introducing the new Muc-Off X-3The Shimano Ultegra Di2 RD R8150 rear derailleur speeds up the shifting process by 58 % compared to the previous generation Dura Ace model RD R9150. The rear derailleur with an uniform cage length and an increased gear ratio of 34 teeth is thus not only faster than ever before, but also guarantees highly precise functionality under all conditions. Features Integrated with Shimano's latest Di2 platform, offering precise and lightning fast electronic