Thread: Tire size?
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      12-02-2008, 11:09 PM   #2
GregW / Oregon

Drives: 2015 M4 Coupe, 2012 ML350
Join Date: Nov 2005
Location: Lake Oswego, OR

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Alternate tire sizes

Originally Posted by MrHarris View Post
I'm getting aftermarket rims, 19x9 and 19x10. I want 255's up front and 275's in the rear. What size tires would I get to keep the factory speedo/look?
Revolutions per mile (which is a more precise indication of overall diameter) is the easist data to look at (following is for PS2s). Stock 245/35s & 265/35s are 807 & 790 revs/mile, respectively. 255/35s for the front are in the ballpark at 799. For the rear, 275/35s are at 783 revs/mile. Both of those are only 1% larger than stock, so should be fine. They should actually make the speedometer more accurate, as it's a little optimistic.

You could also go 265/30 F (822) and 285/30 rear (799) with the right offsets, though these are slightly smaller OD. Check with your wheel manufacturer for another opinion.

Greg Lake Oswego, Oregon, USA
2015 M4 Coupe - Silverstone/Sakhir/CF
2012 ML350