The XT M8000 Single 148mm Boost Crankset Without Chainring from Shimano is a high performance crankset with a Plus 3mm outboard chainline for use with 148mm rear axle widths. The cranks are Forged HollowTech II aluminium to offer unrivalled strength-to-weight ratio and a 70 degree spider arm for optimal rigidity. This set contains cranks only and must be run with SM-CRM80 DCE chainrings and 11-speed HG-X MTB chains. It has a 51.8 mm chain line for use with 148mm Boost rear axle widths and the stiffness and strength has been increased with advanced design due to use with wider spaced bearings and an oversized axle. Available in Black only in 170mm or 175mm.