IXF Hollow Integrated Crankset 104BCD MTB Bike 170mm Crank Set + Chainring + Bottom Bracket(Colorful)The product is shipped based on the color or size of the main image of the product page Colour:colorfulCrank Crank: 170MMMaterial: AL6061 aluminum alloyCompatible: Single/Triple chainring; 7/8/9/10S chainringSpecifications: BCD: 104mm ,related holes distance: 74mmWeight: about 637gAdvantages: the use of AL6061 aluminum alloy, light weight, appearance and fashion, very cool, axial strength, strong compatibility Bottom Bracket Can fit bike bottom 68-73mmSize: 41*24*24hollow one tooth disk axis, for mountain bikes, road cycling bike,folding bike refittingBSA:68--73mm cups-BC-1 37*24/68mm Chain line:48 5mmSuit for Shimano, FSA compatible Giant ATX770 ATX770-D XTC750 and so on Chainring : DECKASMaterial: A7075 Aluminium AlloyBolt Center Diameter: 104mmThickness:4mm,2mm(narrow),3 8mm(wide)Weight: 41g(32T),51g(34T),63g(36T),83g(38T)Process:Full CNC engraving and milling, anodic oxidation, full of the laser markingFunction:Minimize the probability of chain, simplifying the variable speed system, minus the excess weight