Campagnolo's Athena Ultra-Torque Crankset is the culmination of years of design, engineering and trickle-down technology. Its lightweight aluminum construction boasts the stiffness you need for climbing hills and sprinting out of corners. It also 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). Plus, the compact chainrings are specially designed for quiet shifts and long life.