<b>Details:</b><br> Material: aluminum alloy<br> Crank arm length: 170mm<br> Specifications: BCD 104,104mm<br> Crank arm related holes distance: 74mm<br> Compatible: Single/Double/Triple chainring; for 7/8/9/10/11S chainring<br> Bottom Bracket diameter:23.79mm<br> BSA:68--73mm cups-BC-1.37*24/68mm Chain line:48.5mm<br> Weight: a set of left and right crank 650g,plus BB 750g<br>