"The Shimano XT Di2 M8250 groupset brings the brand's first fully wireless shifting system to the trail. The long-cage SGS derailleur pairs with a 10-51t cassette for a full range that covers steep climbs and fast descents alike. A 32t chainring rounds out the build, keeping gearing simple without giving up reach at either end of the cassette. What Our Gearhead® Experts Are Saying:""I clipped a rock hard enough to hear it on my last ride, and the derailleur's Automatic Impact Recovery snapped it back into place before I finished the pedal stroke. That's the kind of recovery that makes wireless feel ready for real trail use, not just a cleaner cockpit."""