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I have third row seats, and would love to get rid of the run-flats.
It seems like the most practical solution (aside from finding an OEM X5 spare) would be to sort out a space saver-type wheel option that would fit in the rear, and mount a space saver tire that compresses a little when not inflated/in use (my allroad has one).
Something like that would potentially fit in the cargo area. Sure, it would take up some space, but for the most part it wouldn't be a big deal. Put it in a nice bag and find a way to secure it to the side frame (i.e. standing up, mounted to the side).
For those who don't understand the hatred for the runflats: Reducing the unsprung weight and rotational weight improves suspension performance, increases fuel economy slightly, and improves acceleration/braking performance slightly. Most importantly, it smooths out the ride a good bit, and makes everything the car does 'better'.
That said, it's not worth risking a flat unless you have a spare. Even if the space saver spare costs $400, run-flats are usually $100 more per tire, so the spare pays for itself up front.
Like I said, I would not miss the run-flats...
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