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Bill, when you ask the dealer this, they will always say you should stay with the run-flats. The main reason is that there is no room for a spare. A few cars with run-flats have a "dummy spare" so you might get something in that spot but if you car has no place for a spare, that's a consideration. You can run other tires and
hope for no problems or keep a couple of cans of tire-inflater on hand.
Run flats do better on high-aspect tires. They also do better on cars without sport suspension. My nephew has replaced 5 run-flats on his 540 with sport suspension.
I have them on my X-5, Bridgestones, no problems so far.
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Bruce Herrmann
97 C4S
'04 330i
'08 Cayenne S
'07 4.8 X-5
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