As Mountain Bikes continue to become more diverse, components must evolve. Shimano Deore XT addresses the needs of today"s riders just like it did when it was first introduced back in 1982 as the world"s first MTB crank.Carbon composite/Steel composite middle ring adds rigidity for better shifting and increased service lifeOutboard bearings maximize stability and stiffnessHollowtech II design maximizes stiffness while keeping weight to a minimumItem SpecificationsColorSilver/BlackWeight850gBB Thread TypeEnglishSpindle Interface TypeHollowtech IIPedal Spindle9/16"Bolt Pattern4-BoltChainring BCD104mmArm Length170mmRings22-32-44Crank-FD TypeMountain TripleBB Shell Width68,73mmCrank Intended UseMountainChain Compatibility9-SpeedDefined ColorSilver