Specifications: BCD 104,104mm, related holes distance: 74mm. Bottom Bracket diameter:23.79mm. Weight: a set of left and right crank 710g, plus BB 820g. Advantages: the use of aluminum alloy, light weight, appearance and fashion, very cool, axial strength, strong compatibility. Hollow one tooth disk axis, for mountain bikes, road cycling bike, folding bike refitting.BSA:68--73mm cups-BC-1.3724/68mm Chain line:48.5mm.