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The electronic Ultegra Di2 RD-R8050 rear derailleur by Shimano stands out for high precision and reliability. Thus, you can fully concentrate on the track and your competitors. The Synchro-Shift feature with two different modes makes the decision for the best chainring/sprocket combination for you at the touch of a button. Di2 rear mech and front derailleur communicate via the E-TUBE cable. The battery-powered comfortable SEIS Di2 shift technology is based on a solid design that offers great stiffness despite a low weight and aerodynamic advantages at that. Besides, the Shimano rear derailleur sits under the cassette to reduce air resistance and to protect the cage from damages. Two cage length options (GS and SS) provide a wide range of gearing compatibility for good performance. Thus, the R DR8050 rear mech is suitable for both road cycling with intensive climbs and aggressive cyclo-cross.

Details:
Electronic rear derailleur for Road and Cyclocross
Compatible with 11-speed
For Direct Mount
Wide Link Design for increased stiffness
Cold forged aluminium
Aerodynamic Shadow Low-Profile design
Cage: short/medium
Compatible with SHIMANO Synchro-Shift
1 E-Tube connector
Compatible cable: EW-SD50
Recommended chains: Shimano HG-EV or HG-X 11-speed (e.g. item no.:2048882)
Material: carbon fibre reinforced plastic (CFK), aluminium
Weight: approx. 242 g (SS), 249 g (GS)

Specifications short cage version (SS)
Total capacity: 35 teeth
Max. chainring size difference: 16 teeth
Smallest sprocket: 11 14 teeth
Largest sprocket: 25 – 30 teeth

Specifications medium cage version (GS)
Total capacity: 39 teeth
Max. chainring size difference: 16 teeth
Smallest sprocket: 11 12 teeth
Largest sprocket: 28 – 34 teeth