Class-leading XTR Race 11-speed Dyna-Sys chainset, integrating the bottom bracket and chainset into a strong, rigid, yet lightweight unitIntegrated design makes installation and adjustments easier than everPrecision bottom bracket bearings are spaced further apart, and are therefore more stable and longer lasting than conventional bottom bracketsXTR Race chainset uses hollow-bonded construction for the L/H crank arm, shaving vital grams where possibleEasy to use splined bottom bracket spindle connection provides a rigid and secure interface between crank and spindle38/28 with a 48.8mm chain line and a 158mm Q-factor ideally suited for XC Race use in conjunction with 11-40T cassetteHollowglide outer chainring is made with a titanium/aluminium composite hollow 3D structure to maximize stiffness whilst keeping weight at a minimumTitanium teeth are used to create a stiff, light weight and hard-wearing chainringCompatible with all new XTR chainringsCompatible with 2x and 1x set-upsFor use with 11-speed HG-X chains onlyAverage weight 640g (without BB)