Built to thrive in the toughest conditions, the Shimano XTR M9250 Di2 Rear Derailleur is the go-to choice for elite enduro racers and XC riders who demand reliability and low weight. Designed to pair perfectly with the compact 9-45T XTR cassette (Medium Cage) or the 10-51T XTR cassette (Long Cage), it delivers ultra-fast wireless shifting and enhanced impact protection, so you stay in control no matter how rough the trail gets. With a rugged build, auto-recovery from impacts, and added ground clearance, it’s Shimano’s most advanced and survivable derailleur yet. Features: Wireless Di2 Shifting: With HYPERGLIDE+ for instant, smooth gear changes Auto Impact Recovery: Resets the derailleur instantly after a hit SHADOW ES: Shimano’s pioneering chain-stabilizing technology for better chain retention and protection 23mm More Ground Clearance: With the new wedge shape Durable Carbon Cage, Skid Plate & Reinforced Pulley: Give you a robust ride you can trust when the trails get rough Protected, Removable Battery: Stays secure on rough trails (Battery not included, but can be purchased separately here .) XTR M9250 Rear Derailleur Specs: Medium Cage Long Cage Works With Medium Cage Model: XTR M9250 Model ID: RD-M9250-GS Max Tooth: 45t Drive Config: 1x Mount Interface: Derailleur Hanger Shift Technology: Wireless Communication Protocol: Di2 Weight: TBD Long Cage Model: XTR M9250 Model ID: RD-M9250-SGS Max Tooth: 51t Drive Config: 1x Mount Interface: Derailleur Hanger Shift Technology: Wireless Communication Protocol: Di2 Weight: TBD Works With The Shimano XTR M9250 Di2 Rear Derailleur is 100% backward compatible with previous generation Shimano 12-speed chains and cassettes. Compatible models include: XTR M9100, Deore XT M8100, SLX M7100, and Deore M6100. The XTR M9250 Rear Derailleur is compatible with the following: Frame: Modern framesets via a derailleur hanger, including the Universal Derailleur Hanger (UDH) Cassette: 9-45t, 10-45t (Medium Cage - GS) 10-51t (Long Cage - SGS) Shifter: XTR M9250 Chain: 12-speed HG: XTR M9100 , Deore XT M8100 , SLX M7100 , Deore M6100 Battery: BT-DN320