Not entirely true - if you get a slow leak (from a nail for example) but keep adding air so the sidewall doesn't collapse, the tire can be repaired. Only if you are forced to drive on a tire that is truly flat will you "crack" the sidewall so the tire cannot be reused.
I speak from recent experience with a roofing nail. I did NOT remove the nail when I noticed the tire was soft but put about 45 lbs pressure in the tire before driving to the dealer, adding air every 50 kms or so. (It was a 125 km trip.)
There was no evidence of sidewall damage because the tire pressure never got below about 20 lbs.
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Bill
650iX Grand Coupe M Sport
Previous - 528i, 533i, 635CSi, 850i, 740i, 745i, 645Ci.
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