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Originally Posted by E90Fleet
The tread is the same as normal tires, so puncture resistance is the same.
For interest:
A friend drove over a 100miles on his runflats with a 2" hole in his tire after hitting a rock or something on the highway and he felt no ill effects
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Thanks, I am a bit surprised that puncture resistance is entirely a function of the tread. Besides the tread, the puncture resistant belt(s), if any, underneath the tread are probably also the same, runflat vs non-runflat, but I wondered if the cross plies are different in a way that affects resistance to penetration. These radial plies would seem to be a lot stiffer and heavier than on non-runflats, judging by how the sidewalls did their job in your example. But I suppose that once a foreign object penetrates the circumferential belt, the cross plies offer little resistance, whatever their other characteristic are.