Shimano Deore XT M8250 Di2 Wireless Upgrade Kit - M8250-SGS Rear Derailleur M8250-R Shifter Battery Charger Quick Link. The Shimano XT Di2 12-Speed Upgrade Kit now provides riders with high performance wireless MTB shifting technology. The kit features an all-new XT M8250 Di2 wireless rear derailleur thats optimized for impact survivability to make it the choice for both Shimanos top enduro athletes and weight-conscious XC racers alike. With built-in Automatic Impact Recovery an impact-deflecting shape and simple covered-pulley solutions this derailleur stands up to harsh trail impacts and still retains its lightning-quick wireless shifting speed and top-level performance. The XT M8250 Shimano Rapid ES shifter feels instantly natural out of the box but can also be molded to fit any hand thanks to its familiar fit and evolved adjustability design. Multiple shift modes like hold-down multi-shift tactile click-through double shift or locked-out single shift deliver precision while a tunable third button allows for additional system tuning or third-party connection. Kit includes an XT M8250 Di2 wireless derailleur XT SW-M8250 Rapid ES wireless shifter BT-DN320 Battery EC-DN100 Charger and Quick Link.