Shimano, Ultegra Di2 RD-R8150, Rear Derailleur, Speed: 12, Cage: GS, Black, IRDR8150E

The ULTEGRA RD-R8150 12 speed Di2 electronic rear derailleur integrates the system charging port and a wireless connectivity unit all while delivering super fast, precise shifting worth of any podium. A single cage length shifts cassettes from 11-30 to 11-34 bringing new versatility.

• Compact SHADOW design includes an integrated wireless unit, charger, switch and LED status indicator.
• Wider range capacity: compatible with 11-30 and 11-34T 12-speed cassettes
• Super fast shifting
• Integrated D-FLY Connectivity
• Maximum low sprocket: 34T