【Material】Crank and Chainring Made of aluminum alloy, light weight, stylish, flashy styling, high axial strength and compatibility
【Crank】:104/64mm.Crank Arm length 170mm, Crank related holes distance 74m,fit 7-12S chains Single/Double/Triple Speed Chainring
【Chainring】Single speed narrow wide 104mmBCD,32/34/36/38T,Round /Oval,Black/Red,Thickness 4mm (1.9mm Narrow, 3.7mm Wide)
【Bottom Bracket】 68-73mm BSA,suit for Shimano, FSA compatible. Giant ATX770 ATX770-D XTC750 and so on.