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My '07 e91 xi sport package came with continental runflats on 17's, which were harsh, unforgiving, and didn't actually grip all that well. Driving over Boston potholes i cracked 4 rims in the first 2 years.
For the summer I now have bridgestone runflats from an '11 on 16's, and they are still somewhat harsh but handle much better and don't crack rims when i go over potholes.
For the winter I'm running continental contiwintercontact non-runflats on 17s.
The non-runflat 17s corner better than the runflat 16s and are also more comfortable.
I'm still trying to figure out how best to start carrying a spare without it filling up my trunk... I might pull out the under-boot tray and attack the area with a sledgehammer or something, as long as the fuel tank/exhaust/etc isn't in the way underneath.
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