Shimano Deore XT RD-M8250-SGS Di2 Wireless Rear Derailleur - 12-Speed Long Cage Shadow ES Black/Gray. The Shimano Deore XT M8250 long-cage derailleur paired with a standard 10-51t M8200 cassette (cassette sold separate) gives all types of riders the range and robustness to tackle every trail on the mountain. With built-in Automatic Impact Recovery a new impact-deflecting wedge shape and simple covered-pulley solutions this derailleur stands up to harsh trail impacts and still retains its lightning-quick shifting speed and high level of performance.

Di2 technology results in precise and clean wireless shifting

Pinpoint ultra-fast shifting and a no-sacrifice 510% gear range

Wide link structure skid-plate design durable aluminum plate and solid pulley add robustness and longevity

Automatic Impact Recovery function instantly returns the derailleur motor to its original position after impact

Shimano Shadow ES technology delivers a wedge-shaped design that reduces the derailleur’s front-facing surface area and eliminates edges that could catch on rocks and roots

Tucked safely inside an enclosed space the battery won’t budge even in rough terrain while remaining easily removable for charging

Solid pulley and shielded pulley teeth prevent trail debris from jamming up your flow