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      12-02-2008, 09:18 PM   #1
MrHarris
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Tire size?

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?
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      12-02-2008, 10:09 PM   #2
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Alternate tire sizes

Quote:
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.
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      12-03-2008, 02:01 AM   #3
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I thought I needed 255/35 and 275/30?
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      12-03-2008, 08:00 AM   #4
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go here and plug in the numbers
http://www.e90post.com/forums/forumdisplay.php?f=12
the front OEM wheels are 8.5" width and an offset of 29
rear are 9.5" offset 23
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      12-03-2008, 09:28 AM   #5
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I thought I needed 255/35 and 275/30?
275/30s are 3% smaller than the stock rears, vs. 1% larger for the 35s. By smaller, I mean circumference, not diameter, which is the important factor. You decide.
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Last edited by GregW / Oregon; 12-04-2008 at 11:11 PM.
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