... .Tensile strength:8-12MPA 4.Competitive price butyl inner tube 400-8 Product DescriptionOur factory is professional in producing motorcycle/wheelbarrow tyre and tube with high quality ... -18,250-18,350-10,100/90-10,300-8,400-8,400-12 etc.2.Motorcycle inner tube size:185-17,200-17,225-17 ... ,250-17,275-14,275-18,300-17,300-18,325 ...