A high performance crankset from the classic MTB group. Forged HollowTech II aluminium cranks offer unrivalled strength-to-weight ratio. Lightweight construction for external super smooth bottom bracket bearings. For use with 12-speed Dyna-Sys DCE single chainrings. SM-CRM85 DCE chainrings are available in 28T, 30T, 32T, 34T and 36T. 55mm chain line for use with 148mm rear axle width. Stiffness and strength increased with advanced design due to wider spaced bearings and oversized axle. 70 degree spider arm for optimal rigidity. For use with 12-speed HG+ MTB chains only. We recommend that the bottom bracket is initially installed by a bike shop to ensure perfect bottom bracket facing and fit.