The combination of the new DEORE M6250 derailleur with a long cage and a standard 10-51T cassette offers all riders the range and robustness to tackle any trail in the mountains at an affordable price. With the built-in Automatic Impact Recovery, a shock-absorbing wedge shape, a steel plate, and a massive idler pulley, this derailleur withstands hard hits on the trail while maintaining the precise shifting characteristics for which Di2 is known. Additional features include an integrated on-board battery that is protected by the linkage and is easily removable for charging, as well as connectivity with bike computers and other third-party devices.