Class-leading XTR Race 11-speed Dyna-Sys chainset, integrating the bottom bracket and chainset into a strong, rigid, yet lightweight unit.Key Features:Integrated design makes installation and adjustments easier than ever,Precision bottom bracket bearings are spaced further apart, and are therefore more stable and longer lasting than conventional bottom brackets,XTR Race chainset uses hollow-bonded construction for the L/H crank arm, shaving vital grams where possible,Easy to use splined bottom bracket spindle connection gives a rigid and secure interface between crank and spindle,38/28 with a 48.8mm chain line and a 158mm Q-factor ideally suited for XC Race use in conjunction with 11-40T cassette,Hollowglide outer chainring is made with a titanium/aluminium composite hollow 3D structure to maximize stiffness whilst keeping weight at a minimum,Titanium teeth are used to create a stiff, light weight and hard-wearing chainring,Compatible with all new XTR chainrings,Compatible with 2x and 1x set-ups,For use with 11-speed HG-X chains only,Average weight 640g (without BB).