Class-leading XTR 12-speed crank set, integrating the bottom bracket and crank set into a strong, rigid, yet lightweight unit Features: Super-lightweight HollowTech II cold forged Duralumin crank arms - hollow design saves weight whilst increasing rigidity and durability Easy to use splined bottom bracket spindle connection provides a rigid and secure interface between crank and spindle With a 52mm chain line and a 168mm Q-factor (1x set up) ideally suited for all-mountain use in conjunction with 10-51T cassette crank set supplied without bottom bracket and chainrings Compatible with all 12-speed direct mount DCE XTR chainrings, please use SM-CRM95 chainrings For use with 12-speed HG+ chains only