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Hi deliberate1,
IF after you get your 135i you feel the need for 17's you could always get a set of them. I use 17's for my winter tire setup. Your gonna spend about $1,100 to $2,000 for a 17 wheel tire, TPS(tire presure sensors) setup. I think the 18's will be fine though.
The one thing to keep in mind is that the run flat tire's ride quality is very sensitive to tire pressure settings. I run mine slightly low. But even just a few psi (4 psi)can make a world of differnce on how hard the car rides with run flats.
Good Luck,
David
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