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What major advancement allowed motorcycles to run without inner tubes in their tires?

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Cast wheels enable motorcycles to use tubeless tires. Unlike traditional tires, tubeless tires don’t require an inner tube to hold air. Instead, a seal between the rim and the tire holds the air pressure.

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Jakub Porzycki/NurPhoto via Getty Images

Jakub Porzycki/NurPhoto via Getty Images

What major advancement allowed motorcycles to run without inner tubes in their tires?

• Spoke rims
• Pneumatic tires
• Cast wheels
• Steel rims