CMC CRANKS III One of the strongest and most unique cromoly 3-piece crankset around. The CMC Crank III (Cromoly Monocoque Construction) is a 3-piece heat-treated crankset constructed using two cromoly stampings and welding them on 360 degrees to create a super rigid crank arm. The set includes the 2 CMC dual pinch clamp crank arms that fit tightly into the 22mm diameter axle via the huge M15 bolts. Tapered and standard bearing spacers, bearing spindle spacer, and chainring bolt are also included for easy installation. No special BB tools needed. Two styles of bottom brackets available; a four cartridge bearing Euro set-up or an American BMX bottom bracket bearings. ................................................................................................................................................................................ Material: 4130 heat treated cromoly Arm size: 175mm with pinch clamp design Axle: 22mm (7/8") 8t splined spindle Color: black (Available with Euro or American BMX BB set)