My wife's car has Continental ContiProContact SSR run flat tires. I drove the car tonight to dinner and upon getting out of the car, I noticed the left front tire was very low. Checked it, and it is flat from a cracked valve stem.
Now there is a possibility that this tire was driven around flat for miles. When I drove the car, I didn't noticed anything, even the way the car handled.

So the question is, how long can you run on a flat- run flat tire before damaging it? After removing it at the restaurant parking lot, it appears to be fine.

Thanks in advanced for the input.


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