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Isn't it one of most common bmw "mods" - to get rid of runflats, to improve handling & performance & comfort? As for alternatives .. imho nothing beats spacesaver tire. Fix a flat kit & compressor is not that much lighter then spacesaver tire, doesn't allow to fix all tire damage problems, and in most cases tire shops won't fix tire that had that gunk used on. Spacesaver will help and can be relied upon, even if you have complete sidewall rip, and in many cases simple puncture of tire can be fixed in tire shop, letting to save on not having to buy two new tires (which will have different wear at that). Also spacesaver in many cars doesn't rob one of trunk space. Hence for all the reasons above imho those "donuts" are of best compromise.
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