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My experience same as donv's.
When I bought my car both rear tires (18" Conti's) had nails in them. One of them has been run-flat, cutting the innerliner, and had to be replaced. A tire dealer experienced with high-performance and racing tires patched the other tire on the inside and so far, 2 yrs later, no problems.
The biggest issue is that not all tire shops have the right eqpt. to handle ultra-low profile tires. Some will try without the right mount/dismount machine and beat the crap out of your wheel in the bargain.
I don't track my car, so high-speed problems are not an issue for me, but would agree that tracking a repaired tire is not a good idea.
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