Our grandparents would agree that they're a modern miracle: tires that keep on turning even when they're flat. But how ...

(B) Reinforced sidewalls keep the deflated tire from collapsing. Wait, what are run-flats? A run-flat tire will run, uh, flat for 50 miles at 50 mph, enough to get you to a repair shop. It's built ...

Auxiliary-supported run flats contain a ring of rubber or a similar material on the interior of the tire, which picks up the slack of the deflated outer tire. This type of run flat is usually ...

Next, we deflated the tire by removing the valve stem core. After the air was released, the vehicle dropped less than one-quarter inch. With run-flat tires, one of the primary hazards is the ...

In addition, if the vehicle continues to drive on the deflated tire, the sidewalls will quickly overheat and fail – often in less than a mile. "Run-flat" tires (also called "extended mobility ...

The main drawbacks are a stiffer ride (often mitigated by the vehicle manufacturer’s suspension tuning), higher replacement cost, and driving on a deflated run-flat in most cases requires ...

We deflated one of the tires on the car to see how the run-flat technology performed. We're glad to say that driving on either a deflated front or rear tire was uneventful; the most noticeable ...

Like prior run-flats, DriveGuard tires are designed to ... Include a bead that keeps tire stuck to rim even when it's deflated. Build it to hold up at a set number of miles at a set speed ...

Extracting 50 miles of use from a flat tire, however, requires more than strength. Driving on a deflated tire—run-flat or not—initiates a destructive cycle: As the sidewall collapses ...

Factors such as whether the tire deflated completely and how far and fast it was driven on will all be considered. Whether you should plug a run-flat tire depends partly on the manufacturer.

BMW says 100 miles, with only the driver aboard. A Greek BMW 635i owner recently drove 220 miles on a deflated Bridgestone run-flat with no drama or visible signs of damage. Then there's the ...