SHIMANO DEORE Rear Derailleur (Di2 spec.) RD-M6250-SGS 12 -speed 1st group

Pairing the new DEORE M6250 long-cage derailleur with a standard 10-51T cassette gives all types of riders the range and robustness to tackle every trail on the mountain at a more approachable cost. With built-in Automatic Impact Recovery, an impact-deflecting wedge shape, steel plate, and solid pulley, this derailleur stands up to harsh trail impacts, while retaining the precise shifting qualities for which Di2 is known. Other features include integrated on-board battery that's protected by the linkage and easily removable for recharging and connectivity with cycling computers and other third-party devices. 

• Robust Design: A wide link structure, skid-plate design, durable steel plate, and solid pulley add robustness and longevity.
• RD Protection Function: The new Automatic Impact Recovery function instantly returns the derailleur to its original position after impact.
• SHIMANO SHADOW ES: A slimmer, stronger evolution of SHIMANO's pioneering chain-stabilizing SHADOW RD+ concept.
• Precise & Clean Wireless Shifting: Ultra-fast shifting and a no-sacrifice 500% gear range.
• Protected Battery: Tucked safely inside an enclosed space, the battery won't budge even in rough terrain, while remaining easily removable for charging. *The battery is sold separately.
• Covered Pulleys/Cage: The solid pulley and shielded pulley teeth prevent trail debris from jamming up your flow.