The Shimano XT M8250 Di2 Wireless Upgrade Kit brings your 12-speed mountain bike drivetrain into the future with fast, reliable wireless shifting and impact-ready durability. Designed to meet the needs of trail and enduro riders, this upgrade kit includes everything needed to convert to Shimano&';s latest Di2 system. At the core is the RD-M8250 rear derailleur, built with a wide-link design, solid pulley construction, and 23 mm of added ground clearance for improved impact protection. Shimano&';s new Automatic Impact Recovery function helps maintain performance after crashes by resetting the derailleur&';s position instantly. Whether you opt for the mid-cage with a 9-45T cassette for a lighter setup or the long-cage with a 10-51T cassette for maximum range, the M8250 delivers precise, stable shifting you can trust on any terrain. The SW-M8250 Di2 shifter offers a familiar feel with improved adjustability thanks to Shimano&';s I-SPEC EV mounting system. It features a responsive tactile click, customizable shift modes including multi-shift options, and a programmable third button for added control via Shimano&';s E-TUBE PROJECT app. This upgrade kit includes the derailleur, shifter, internal battery, charger, and a 12-speed quick link, making it a complete solution for riders ready to experience wireless shifting at its best. Key Features: Wireless Shifting with Impact Recovery - The RD-M8250 rear derailleur features fast, reliable wireless shifting and Shimano&';s Automatic Impact Recovery, which resets derailleur position after crashes for consistent performance on rugged terrain. Customizable Control and Ergonomics - The SW-M8250 Di2 shifter integrates with Shimano&';s I-SPEC EV system for improved ergonomics, tactile feedback, and user-defined shift modes-including multi-shift and a programmable third button via the E-TUBE PROJECT app. Complete Upgrade Kit for 12-Speed Drivetrains - Includes the derailleur, shifter, battery, charger, and quick link-providing everything needed to upgrade to Shimano&';s advanced 12-speed Di2 wireless system.