The Shimano Dura-Ace RD-R9250 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 11-28 to 11-34, offering exceptional versatility.-Ultra-fast rear Di2 shifting-Compact design includes an integrated wireless unit, charger, switch-Wider range capacity-Max. low sprocket: 34T-CFRP rear derailleur plate-LED status indicator