A high performance chainset from the classic MTB group, using the most advanced 11-speed Dyna-Sys chainrings Forged Hollow Tech II aluminium cranks offer unrivalled strength-to-weight ratio Lightweight construction for external super smooth bottom bracket bearings Steel inner ring combined with a thicker aluminium & carbon composite Hollow outer ring for excellent rigidity & durability Close ratio gear combination for minimum shifting gap provides enhanced cadence while reducing pedal feedback on suspension bikes With a 51.8 mm chain line ideally suited for 27.5+ bikes with Boost 148 mm O.L.D. Available in 36-26T, 34-24THG-X chainring with patented spike pins give smooth & fast gear shifts under load Stiffness & strength increased with advanced design due to wider spaced bearings & oversized axle 70 degree spider arm for optimal rigidity For use with 11-speed HG-X MTB chains only We recommend that the bottom bracket is initially installed by a bike shop to ensure perfect bottom bracket facing & fit