The shimano xtr m9000 race 1 x11 speed crank set is ideal for those who value lightweight and strength for their cross country mountain bike this cross country race focused fc m9000 crank can run 1x or 2x chainrings on its narrow 158mm q factor crank arms saving weight through the targeted application of hollow bonded construction the crank arms are made from 3d hollow structure carbon aluminium construction which increases stiffness these cranks are designed to be used in conjunction with a