Shimano XT M8250 Di2 upgrade, SW-M8250 band-on, BT-DN320, EC-DN100, SM-CN910, GS mechXT wireless drive train upgrade XT Shadow ES 12 speed wireless rear derailleur for the ultimate in shifting performance and durability The integrated removable on board battery is protected within the linkage Crash recovery function, absorbs impacts and returns to its original position Connectivity BLE, ANT private Shadow ES features a super low profile skid plate design and optimized slant angle for optimal clearance Shadow ES uses a dual spring
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