Product Description The Shimano FC-M770 crankset is engineered for the way YOU ride. HollowTech II construction ensures maximum stiffness without any weight penalty. This is the perfect upgrade for any trail or race bike that is not already sporting a set of these cranks.HollowTech II Crank BB interfaceSteel/Carbon composite construction and middle gear doubles durabilityGearing: 22-32-44tBB Included