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The Pirelli Heavy Duty 21" Inner Tube is designed for riders who take their bikes through serious off-road conditions. Built with thick, rugged rubber and a TR-4 center-mounted metal valve stem, this tube offers maximum resistance to punctures, pinch flats, and rough impacts. It's the go-to choice for motocross, enduro, and dual-sport riders looking for durability and peace of mind.Size: 21-inchValve Type: TR-4 (center metal valve stem)Material: Heavy-duty rubber for enhanced protectionIdeal For: Front wheels on dirt bikes, adventure bikes, and trail bikes