Truvativ GXP M15 Crank Bolt & M26 Cap Review Posted by GiantPandaisy July 9, 2018 in Drivetrain Components This fits your . Make sure this fits by entering your model number. Bolt Fits: GXPCrank Bolt Size: M15/M26 (alum) TruVativ Crank Arm Fixing Bolts Cycling Outdoor Recreation Parts & Components Sports & Outdoors Truvativ