Open Box - 3T Torno Crankset 172.5mm/40TPerfect aero upgrade for on road & off road. Hand built at 3T factory in Bergamo, Italy. Integrated carbon axle & spider for 350g weight and best power transfer. The crank is one of the most complex parts for aerodynamics; the leading edge of your shape becomes the trailing edge 180 degrees later, you have the major influence of the forward speed and the minor influence of the rotational speed, your feet spin by, the frame is right there, the chain