Centaur 10s Red&Bk 39/53 172.5 Forged aluminum crankarms plus chainrings with Micro Precision Shifting (MPS) in light alloy with anti-friction treatment 8 pin large chainring for faster upshifts Integrated PowerTorque axle sytem requires PowerTorque cups (not included) 738 gramsItem SpecificationsColor: red & blackSize: 172.5UPC: 8004995861358MPN: FC12-CERB293Sold Individually