wo manufacture motorcycle inner tube,including natural inner tube and butyl inner tube.175-17,185-17,250-14,250-16,250-17,250-18,275-17,275-18,275-21,300-8,300-10,300-16,300-17,300-18,300-19,325-18,350-8-350-10,350-18,40-8,400-16,450-12,450-18,90/90-18,110/90-16,130/90-15 and so on.