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      03-09-2010, 08:00 PM   #1
AbeFroman
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Tire size for 18x8.5 wheel

Should I go with 225/40/18 or 235/40/18? Offset is +40, non-sport suspension.
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      03-10-2010, 11:40 AM   #2
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if it's for the front, 225

if it's for the rear, 255
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      03-11-2010, 07:54 PM   #3
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Get on tire rack and check the tire diameter. The idea is generally to get the front and rear diameters to match, or pretty close.
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      03-28-2010, 09:13 PM   #4
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Hey help me out if I put 255/40/17's on the rear will i have anyproblems with rubbing....or what is it I need to do to fitr these to my car....
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      04-26-2010, 03:00 PM   #5
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I have 275's running on the rear and no rubbing. Oh, you also want to size down on the tirewall for the rear.

275/35/18 rear, and 235/40/18 front. I'll be switching to 245's in the front next.

My car is a 3.0i.

The rear tends to be pretty forgiving I find, but I also have neg 3 degrees of camber back there.
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      04-26-2010, 08:02 PM   #6
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On stock Z4MC wheels, I'm running 245/40/18 on 8 inch front and 265/35/18 on 9 inch rear with no rubbing at all.

Based on other replies looks like you can get away with 225-245 on fronts and 255-265 on rears with stock wheels.

I've written several dealers and with different wheels, looks like you could go up to 255/35/18 on fronts with 9 inch wheels and spacers, then 275-285 on rear with 10 inch rim, maybe spacers........
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