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 Hollow Tech II aluminium to offer unrivalled strength-to-weight ratio & a 70 degree spider arm for optimal rigidity. This set contains cranks only & must be run with SM-CRM80 DCE chainrings & 11-speed HG-X MTB chains. It has a 51.8 mm chain line for use with 148mm Boost rear axle widths & the stiffness & strength has been increased with advanced design due to use with wider spaced bearings & an oversized axle. Available in Black only in 170mm or 175mm.