Shimano Ultegra Di2 RD-R8150 12 Speed Rear Derailleur (Black) Return-Yes where the smallest sprocket has

where the smallest sprocket has 10t

Disc Brake

Sizes: US/M = 50-57 cm

But they’re so much more than that

M: Bontrager Comp Lowriser

Shimano Ultegra Di2 RD-R8150 12 Speed Rear Derailleur (Black) Return-Yes where the smallest sprocket hasThe 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