Battery available here

The all-new DEORE XT M8250 long-cage derailleur paired with a standard 10-51T M8200 cassette 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.

 

• Robust Design: A wide link structure, skid-plate design, durable aluminum 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.
• Covered Pulleys/Cage: The solid pulley and shielded pulley teeth prevent trail debris from jamming up your flow.

 

Cage Length	SGS/Long
Total Capacity	41T
Color	SERIES COLOR
Mount	Direct attachment (conventional)
Guide Pulley Bearing	Sealed Bearing
Tension Pulley Bearing	Sealed Bearing
Max Low Sprocket	51T
Min Low Sprocket	10T
Rear Speeds	12
Top Normal Spring Type	Shimano Shadow RD+