How do tubeless tires retain air?

The correct response highlights that tubeless tires retain air primarily through their unique structural design. This design incorporates an airtight rubber lining that forms a seal with the rim of the wheel, preventing air from escaping. Unlike traditional tires that rely on an inner tube to hold air, tubeless tires are constructed to create a tight fit and a vacuum that keeps the air contained.

This design not only allows for a better seal, reducing the risk of punctures and air loss, but also eliminates the additional weight and complexity of inner tubes. The emphasis on structural integrity means that tubeless tires can maintain pressure effectively, offering drivers improved performance and safety. Also, the ability to use sealants in conjunction with this design enhances the tire's ability to self-seal punctures, further protecting against air loss, but that relies on the initial structural design to function properly.

Utilizing a continuous inflow of air or relying on inner tubes would not apply to tubeless tire technology, as these methods are not part of how they are engineered to retain air effectively.