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      09-03-2012, 10:47 AM   #1
nwflbimmer
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tire sizes

I have my new wheels and I am getting a little rub on the fender wells on my '07 M Coupe. I need to order new tires this week, How much difference is there in diameter between 225/45-18 and 225/40-18? Can anyone help with this?

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      09-03-2012, 11:14 AM   #2
nwflbimmer
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never mind it seems to be about a 1/2" less for the 225/40/18
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      09-20-2012, 01:59 PM   #3
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We would recommend the 225/40/18 in the front of a Z4MC, as the 45 sidewall is very tall and cause rubbing on the fenders, especially if you are lowered.
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