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The Pirelli Heavy Duty 18" Inner Tube is built tough for demanding riders. Made with extra-thick rubber and a TR-4 metal valve stem centered on the tube, it’s designed to handle rough trails, rocks, and off-road abuse. Whether you ride motocross, dual-sport, or trail, this tube helps resist pinch flats and keeps you rolling with confidence.Size: 18-inchValve Type: TR-4 (centered metal stem)Build: Heavy-duty rubber for added puncture resistanceBest For: Off-road, motocross, enduro, and adventure bikes