Heavy-duty inner tubes engineered for demanding motorcycle and powersports applications. These 21" tubes feature center metal valves for reliable air retention and easy inflation. Built with reinforced rubber construction to withstand high pressures and rough terrain. Available in multiple sizes to fit your specific wheel requirements. Choose the size that matches your tire specifications for optimal performance and longevity. Perfect for cruisers, touring bikes, and off-road vehicles that demand durability and dependability.