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

Retry Correct Incorrect 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?

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