Shimano Deore RD-M6250-SGS Di2 Wireless Rear Derailleur - 12-Speed Long Cage Shadow ES BLK/GrayLose the wires, save some dollars Pairing the new Shimano Deore M6250 Di2 Rear Derailleur with a standard 10 51T cassette gives riders the wireless adaptability and robustness of Shimano Di2 MTB at a more approachable cost. A wireless Deore Di2 rear derailleur thats big on performance and lighter on your wallet. Wide link structure, skid plate design, durable steel plate, and solid pulley add robustness Automatic Impact Recovery instantly returns the