Campagnolo Record Ultra-Torque 172.5mm 53- 39 Carbon Crankset Bottom Bracket and Chainrings Not Included. Full Carbon crank arms and spider are hollow for maximum stiffness and minimal weight. Utilizes USB ceramic ball bearings. Utilizes Campagnolo’s Ultra-Torque crank system. USB ceramic bearings increase smoothness and decrease rolling resistance, weight and the need for maintenance. USB bearings are 50% smoother than standard…