Shimano RD-R8150 Ultegra Di2 Rear Derailleur 12 Speed

With the fast and accurate Di2 shifting technology, the Shimano 12-speed Ultegra RD-R8150 rear derailleur is extremely versatile thanks to a single cage length option compatible with 11-28, 11-30, and 11-34 cassettes.

Compact design includes an integrated wireless unit, charger, switch
Wider range capacity
Max. low sprocket 34t
LED status indicator
Battery indicator, pairing, adjust mode etc.
Largest Cog: 34
Rear Derailleur Mount Type: Shimano Rear Direct Mount , 10x1 Standard
Chain Wrap Capacity (teeth): 39
Rear Der/Shifter Compatibility: Shimano Road Di2
Cage Length: Medium
Drivetrain Speeds: 12
Color: Black