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AFAIK, there is a BMW "tire repair kit" like what was available for e46 M3. It consisted of some tire sealant in a pressurized can. Of course, you could buy a similar sealant elsewhere but this can only likely be used for simple punctures like from a nail. For significant tire damage, like to the side wall, the tire is done. You'd have to mount a spare in order to stay mobile.
But you raised a good question because I wonder if folks here running 19" (or larger) non-runflat tires are carrying spares.
Runflat or otherwise, I'd guess that tire availability (from franchise to mom-and-pop stores) may not be so great for large low profile tires. But i could be wrong.
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