... sprocket chain wheel, tricycle sprocket, farm vehicle sprocket, industrial sprocket chain wheel gear etc. This is a sprocket factory that make motorcycle sprocket chain wheel, tricycle sprocket, farm vehicle sprocket, industrial sprocket chain ... twice abrasive resistance as much as common sprocket, hardness reach RC35-50;5\OEM ... 14T/15T/16T/17T/18T etcChain 420,428,428H,520,530MaterialA3# steel(SAE Q235 ...