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      12-04-2013, 12:43 AM   #1
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Question Puzzled with the BMW recommended wheel sizes - HELP!

Gentlemen,

I am now in search for the winter wheels for my Z4 coupe (non-M).

My manual says I should buy 225/45-17 Mud +Snow wheels. This means I would have to buy new rims (I now possess 18" style 203 rims for the summer).

Meanwhile the MCoupe manual recommends 225/40-18 M+S wheels.

I am pretty much puzzled with that discrepancy in recommendations.

Do you think there is some logic behind those recommendations, or I can buy the studded 225/40-18 for non-m coupe with no additional risk?

Thanks!
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      12-04-2013, 10:36 AM   #2
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      12-04-2013, 11:18 AM   #3
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the z4m size should be 225/45r18.

for the 203's, you can get 225/40r18's for all four corners. the rear will look stretched, but it will fit. if you're worried about exact fitment you might be able to find 225/40r18 for the front and 255/35r18 for the rear, but they may be super expensive or difficult to find.
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