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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Fitment Help!!!! Asap!!!!



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Wheel offset calculator courtesy of BimmerPost.com. You may use this calculator to calculate what tire sizes you might need if you upgrade your tires, or what wheel sizes/offsets are compatible with your car.
    Current Wheel Width  inches             Current Wheel Offset  mm.
         New Wheel Width  inches                  New Wheel Offset  mm.
 
TIRE WIDTH
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ORIGINAL TIRES
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NEW TIRES
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Based on your stock wheel setup, your new wheel will have:
Original Tires Diameter (in.)
      New Tires Diameter (in.)
  Difference in diameter (in.)
           Percent Difference %
                     
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      09-10-2012, 03:27 PM   #1
jwongie
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Fitment Help!!!! Asap!!!!

20x10.5 rears +35mm 255/30/20? 275/30/20

Will they fit?

Help ASAP!
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      09-10-2012, 05:33 PM   #2
phillip@bmpdesign
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year? model?

I wouldn't recommend a 255 on a 10.5" wheel, based on the year it may not handle a 10.5" on the rear, and definitely not on the front.

-Phillip Wilmeth
BMP Design
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      09-11-2012, 09:00 AM   #3
PSUSMU
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Quote:
Originally Posted by phillip@bmpdesign View Post
year? model?

I wouldn't recommend a 255 on a 10.5" wheel, based on the year it may not handle a 10.5" on the rear, and definitely not on the front.

-Phillip Wilmeth
BMP Design
Someone here has 10.5" up front. Don't listen to this guy.

On your 128i? Wrong forum. On a E90/92? Do a 265/30.
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      09-11-2012, 09:59 AM   #4
phillip@bmpdesign
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Traditionally speaking, when manufacturers publish the spec on their wheels and stamp the dimensions on the spokes it is from bead to bead since that is the technical requirement for the tire fitment. Some retailers will publish actual width which would be from lip to lip which can be .75" to 1" wider than the manufacturers published bead to bead width.

Taking that into account that would mean that the lip of a 10.5", wheel should be closer to 11.5" but lets call it 11" since we don't know for sure, would sit about 4" from the face of the rotor and 7" from the face of the rotor to strut with a +35 offset. Is it possible, probably, but that would be a pretty tight fit especially when turning. There are also variances to the year model, the rear end was redesigned with the LCI midway through 2008 that calls for tighter restrictions on wheel offsets.

Quote:
On your 128i? Wrong forum. On a E90/92? Do a 265/30.
As far as the tire size goes. A 265/30r20 is roughly 10.4"-10.7" wide depending on manufacturer. Which would set it right at about the same width as your wheel and pushing the limit as far as fitment for that combination tire and wheel. Most manufacturers recommend a 9"-10" wheel depending on model and brand with a 10.5" as max only on specific models.

-Phillip Wilmeth
BMP Design
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      09-11-2012, 10:13 AM   #5
PSUSMU
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Just stop.

-Derek Zoolander
Fitment Expert
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      09-13-2012, 11:47 AM   #6
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we normaly do 20x10 or 20x10.5 with a 37et and a 285/25/20
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