SHIMANO FC-6703 Ultegra Triple Crankset Hollowtech II design uses a wide bearing placement to maximize stiffness while keeping weight to a minimum. HollowGlide hollow outer chainring reduces weight, increases strength and enhances stiffness of the entire crankset by 20% for even more shifting power Wider gear range accommodates most cycling situations and offers less chain touch in the small/small combination Individually machined chainring teeth improve chain contact for greater shifting performance Improved bottom bracket seals reduce contamination and friction