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The Pirelli Heavy Duty 21" Tube is built for serious riders who need strength and reliability on tough terrain. Made with thick, puncture-resistant rubber and a center-mounted TR-4 metal valve stem, this tube is ideal for front wheels on dirt bikes and dual-sport machines. It’s tough enough to take on sharp rocks, hard landings, and high-speed trails without letting you down.Size: 21-inchValve Type: TR-4 (center metal stem)Construction: Extra-thick, heavy-duty rubberUse: Great for motocross, enduro, adventure, and trail riding