Campagnolo 2012 Centaur Crankset 170 53-39 Carbon Power-Torque 10 Speed Full carbon unidirectional construction for the crankarms with Micro Precision Shifting (MPS) chainrings in light alloy with anti-friction treatment 8 pin large chainring for faster upshifts Integrated PowerTorque axle sytem requires PowerTorque cups (not included) 644 grams