As someone who might soon be purchasing a 135i with the M Sport package, this thread has been pretty helpful. I'm curious to know, though, what do most people do about a spare once the run-flats have been ditched, particularly on a vehicle with different sized front and back wheels?
On a related note, I have run-flats on my current car ('06 330i) and have driven on a flat one for several miles without problems. They seem to work quite well in that regard, despite all of their downsides.
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