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he Pirelli Heavy Duty 18" Inner Tube is made for riders who need extra durability in tough riding conditions. Built from thick rubber and equipped with a TR-4 center-mounted metal valve stem, it’s ideal for off-road, dual-sport, or enduro bikes. This tube is designed to handle rough terrain, high impact, and sharp debris—helping reduce the chances of pinch flats and blowouts.Size: 18-inchValve Type: TR-4 (center metal valve stem)Material: Heavy-duty rubber compoundUse: Great for motocross, trail, adventure, and off-road riding