I have an M5- with the mobility kit.
After getting stranded 110 miles from home for 2 days, I swore never again. I now carry a full size front wheel in the trunk, jack, lug wrench. It has saved me 4 times. What would be a many hour, to overnight delay (with potentially needing to buy an new unmnatched tire at retail) is now a 20 minute pause.
That being said, my 2010 and 2012 has 255/50-19 Michelins and seems to ride just fine. But I have the spare too...
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