On a run-flat tire, the sidewall is stiff enough and strong enough to support the vehicle’s weight even if a leak causes a complete loss of air pressure. That’s because air pressure inside is what’s normally supporting the vehicle’s weight and keeping the tire round without that air pressure, the sidewall of the tire collapses and the tire goes flat. Normally, a flat tire looks like a tire that’s completely flat on the bottom, making it seem as though the car is riding on the wheel rather than the tire. You still have to get the tires fixed or replaced, but you don’t have to do it right then. Whatever the name, the idea is that they can be driven on - at least for a short distance - even if they lose all their air pressure. Related: What’s the Difference Between Summer, Winter and All-Season Tires? Perhaps it’d be more accurate to say “run-without-air-pressure tires,” though that would also be somewhat of a mouthful. Although run-flat tires have been around awhile, their name can be a bit misleading.
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