Avon Standard Butyl Motorcycle Tube Avon standard motorcycle tubes are designed for riders utilizing conventional spoked rims on modern bikes or traditional rims on classic motorcycles. Constructed from 100 percent butyl polymer, these tubes stand apart from blended alternatives that contain natural rubber. The real butyl construction reduces air leakage, effectively maintaining pressure for extended periods. Additionally, they offer superior shock absorption and are highly resistant to heat, aging, punctures, and various weather conditions. Features: Tr87 valves are 90 degree, TR4 Valves are straight Manufactured to the highest quality as approved by all the Japanese motorcycle manufacturers Each tube is individually boxed with a full range of sizes and valve stem types clearly marked on each box end Real butyl tubes made from 100 butyl polymer 100 butyl tube minimizes natural air leakage while maintaining air pressure for a longer period of time