Shimano XT FC-M8120-B2 Crankset The new generation of XTSince their introduction many years ago, Shimano Hollowtech cranks have been the best cranks you can put on a mountain bike. Extremely strong, remarkably lightweight, and stiffer than a straight shot of whiskey. The crankarm construction exemplifies the level of craftsmanship that's put into a Shimano crankset, utilizing a 3D hollow bonded structure to further reduce weight and increase stiffness. Chainrings are easily exchanged with the new direct-mount system and the cranks can be swapped between single and double front chainring setups. Features Hollowtech IIConstruction Gear Combination: 36-26TShimano Part Number: FC-M8120-B2SPECIFICATIONSSpeeds2x12Spacing Boost BB Compatibility24mm spindle Chain Ring36-26TCrank Arm Length165 mm, 170 mm, and 175 mm BB Sheel Width68, 73, 74, 75, 76mm O. L. D. 148mm Chainline51. 8mm Q-Factor178mm Bottom Bracket Included No Intended Use Trail, All-mountain Weight654g | Shimano | Xt Fx-M8120-B2 Crankset 165Mm, 36/26 Tooth, Boost Spacing | Aluminum