Hankook is continuing to develop a non-pneumatic tire for passenger cars, and the iFlex is the ... As the name suggests, NPTs do not require air pressure. Hankook Tire has continued researching ...

Narrator: From the wheels of NASA's moon rover to Michelin's Tweel, we've seen tires that don't need air for decades. We've even seen prototypes for everyday cars that roll over sharp nails with ease.

Amerityre Corporation announced today that production quality prototypes of its "zero pressure" (no air ... The polyurethane tire is manufactured directly onto the car wheel, and never needs ...

Firestone recommends releasing excess air through the valve stem, but only after the tire is completely cold—ideally after parking the car for a few hours.

You should also check your vehicle’s spare tire periodically as air can leak out over time — that is, if your car has one (some just include an inflator kit). Note that some of the small ...

So, if you’ve noticed that your car is sitting a bit lower to the ground or that a tire looks a little flatter, it may be time to add some air. But how do you know what the proper tire pressure ...