Q: I have had two flat tires this summer. Both from nails. One was a roofing nail and the other was a 2 3/4-inch spike. In both cases only the head of the nail was showing on the tread. How does a nail lying horizontal on the pavement re-position itself, so the point drives itself into the tire and leaves only the head showing with (in my case) over 2 inches of the spike going straight into the wheel? I guess I'm lucky they weren't in the sidewall.

T.K., Lombard, Ill.

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