Bridgestone Ultra Heavy Duty Tire Tubes Bridgestone Ultra HD Tubes are designed for durability and versatility. Whether navigating roads, trails, or tracks, these tubes are approved for highway use across all sizes, ensuring reliable performance in various conditions. Features: Ultra heavy-duty motorcycle inner tubes All sizes safe for on-road use Excellent for the rigors of motocross or the high load requirements of cruisers and touring bikes Engineered with the same tech as Bridgestone motocross tubes Tr-4/6 straight metal stem (8mm diameter) Bridgestone's thickest inner tube carcass Safe for on-road, ADV and dual sport applications