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Robust. Resilient. Ready for anything. Shimano's XTR Di2 M9250 rear derailleurs feature all-new wireless Di2 shifting and automatic impact recovery.The all-new XTR M9250 long-cage derailleur paired with a standard 10-51T M9200 cassette gives riders and racers the speed, range, and robustness to tackle every trail on the mountain.With built-in Automatic Crash Recovery, an impact-deflecting shape, and simple covered-pulley solutions, this derailleur stands up to harsh trail impacts and still retains its lightning-quick shifting speed and top-level performance.Main features:Robust Design: A wide link structure, skid-plate design, durable carbon plate and solid pulley add robustness and longevity.RD Protection Function: A new automatic impact recovery function instantly returns the derailleur motor to its original position after impact.Shimano Shadow ES: A slimmer, stronger evolution of Shimano's pioneering chain-stabilizing Shadow concept.Precise & Clean Wireless Shifting: Wireless Di2 paired with HyperGlide+ technology result in smooth, precise and instantaneous shifts.Wedge Shape: The new wedge shape of Shimano's most survivable rear derailleur to-date avoids more direct impacts, and smoothly glances off rocks if there is a hit.Protected Battery: Tucked safely inside an enclosed space, the battery won't budge even in rough terrain, while remaining completely removable for charging.Features:Battery and charger sold separately.Model: RD-M9250-SGS.Series: Shimano XTR Di2 M9200.Weight: --- g.Speed: 12S.Cage type: SGS (long cage).Compatible chain: HG 12S.Spring type: Shimano Shadow ES.Max. front difference: ---.Total capacity: 41T.Low sprocket max.: 51T.Low sprocket min.: 51T.Top sprocket max. : 10T.Top sprocket min. : 10T.Pulley teeth: 13/13T.Di2 shifting.Di2 connectivity wireless: Bluetooth LE / ANT+.References:IRDM9250SGSA: Shimano XTR Di2 RD-M9250-SGS Rear Derailleur, Long Cage, 12-speed (Battery and charger not included).