Dura Ace Di2 RD-R9250

The DURA-ACE RD-R9250 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 to the world's best road component group. 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 Fastest ever rear shifting, 58% faster than RD-R9150 Integrated D-FLY Connectivity Maximum low sprocket: 34T Attributes Max Front Difference 16T Maximum Cog 34T Minimum Cog 11T Primary Color Black Cage GS RD Capacity 37T RD Spring Type Shadow RD Weight 215g Speed 12 Mount Standard