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 Der/Shifter Compatibility	Shimano Road Di2
Rear Derailleur Mount Type	10x1 Standard
Drivetrain Speeds	12
Chain Wrap Capacity (teeth)	39
Cage Length	Medium
Color	Black