CHAINWHEEL&CRANK 1.THE BEST MATERIAL 2.REASONABLE PRICE 3.IMPECCABLE TEST SYSTEM 4.HAVE OWN FACTORY CHAINWHEEL&CRANKJL-NO-616ASIZE:36T*165MMQTY ... 20KGSMEAS:46*29*16CMwe specialize in designing,developing and manufacturing bicycle,BMX and their spare parts.our company have developed ... assembling and quality-testing system.the main products are child bicycle,front&rear hub spindle,B.B.parts,brake cable, ...