WhoU4 has it right, they're not really fragile, I think you've just had some really bad luck with tyres. If I had that bad of luck with tyres I think I might have kept my run-flats. I replaced the run-flats with standard tryes on my Z4 and am very happy with the ride quality, but I do carry an air compressor to deal with flats along with roadside assistance for catastrophic tyre failures. It is a bit of a risk but I prefer the ride quality.
GL either way you decide to go.
dave
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