Model Number: FC-M8000-1 OR FC-M8000-2 Series: DEORE XT Cassette Compatibility: 11 4-Arm Chainrings: x Chainring Sizes: 32T / 36-26T Bolt Circle Diameter P.C.D.: 96/64mm Crank Arm Length: 170, 175 Crank Arms: HOLLOWTECH II Technology Bottom Bracket: BB-MT800 / BB-MT800-PA Chain Line: 48.8mm BB Shell Width: 68, 73mm