dockmoor mountain bike crankset - 170 mm 104 bcd mtb crankset bmx crankset bicycle parts crankset with bottom bracket for bike crank replacement - black dockmoor <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>