Campagnolo is all about bicycle evolution and their Chorus Ultra-Torque Crankset proves it. It sports a unique, integrated spindle design that joins the two sides of the crankset together via a toothed Hirth joint in the center. Bottom-bracket bearings are included and fit into outboard cups (sold separately). The design's stiffness allows the multi-directional carbon crankarms to be thinner and lighter than ever before. Plus, the compact Chorus chainrings allow for easy pedaling over undulating terrain and sport special pins as well as plating for quiet shifts and long life.