Class-leading XTR Race 11-speed Dyna-Sys chainset, integrating the bottom bracket and chainset into a strong, rigid, yet lightweight unit. 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 provides a rigid & secure interface between crank & spindle. Hollowglide outer chainring is made with a titanium/aluminium composite hollow 3D structure to maximise stiffness whilst keeping weight at a minimum. Titanium teeth are used to create a stiff, light weight & hard-wearing chainring Key Features XC Race Specific Hollow Tech II Crank Arm Narrow Q-Factor (158mm)