SHIMANO XTR 12-SPEED MTB CASSETTE SPROCKETWith its BEAM SPIDER construction, the XTR M9100 12-speed cassette shaves weight while increasing SHIMANO's MTB gearing range another gear. Using SHIMANO's new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile, these 10-45 and 10-51T cassettes deliver the best MTB shift experience on offer.FEATURES Definitive ShiftingLet you pedal continuously while shiftingIncreased acceleration by reducing inertia and weight by BEAM SPIDER constructionTECH SPECSMODEL NO: CS-M9100-12SERIES: XTR M9100 SeriesAverage weight: 367 (10-51T)Combination: 10-12-14-16-18-21-24-28-33-39-45-51TCombination name (Group name): 10-51TType: HYPERGLIDE+Compatible chain: HG 12-speedType: HYPERGLIDE+Rear speeds: 12Aluminum gear_QTY (pcs): 3Aluminum spider arm_QTY (pcs): 1MICRO SPLINE: YesSteel gear_QTY (pcs): 4Titanium gear_QTY (pcs): 5