Campagnolo's Athena Power-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 Campagnolo's lightweight Power-Torque integrated spindle design for optimum stiffness and efficiency. Bottom-bracket bearings are included and fit into outboard cups (sold separately). Plus, the chainrings are specially designed for quiet shifts and long life.