motorcycle drive chain, such as 428,428h,520,520h,420,420h,530,530h motorcycle drive chain, such as 428,428h,520,520h,420,420h,530,530hmaterial: 40Mnwith heat-treated and preload, with standard thickness and standard break loadchain have exported to south america with large qty,such as argentina,colombai and so on high quality 428 motorcycle chain