CHAINWHEEL&CRANK 1.THE BEST MATERIAL 2.IMPECCABLE TEST SYSTEM 3.REASONABLE PRICE 4.HAVE OWN FACTORY CHAINWHEEL&CRANKJL-NO-615ASIZE:40/44 ... have developed a semblance-designing,product-assembling and quality-testing system.the main products are child bicycle,front&rear hub spindle ... ,B.B.parts,brake cable,saddle,pedal,basket etc.our products are ...