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 Chorus chainrings sport special pins and plating for quiet shifts and long life.