Class-leading XTR 12-speed crank set, integrating the bottom bracket and crank set into a strong, rigid, yet lightweight unitDirect mount chainrings are lightweight and easy to replace while providing increased rigidity, can be set up as single or doubleIntegrated bearing preload design is lightweight and makes installation and adjustments easier than ever,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 56.5mm chain line and a 171mm 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.