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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 > Wheel size and offset help



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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.
 
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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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      12-30-2012, 11:24 PM   #1
jc824
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Wheel size and offset help

Was planning on purchasing aftermarket rims for the winter setup on my 2008 m3.

The rims have the following specs:

5x120
ET 15
18x8.5JJ

Was planning on running 245/45/18's for tires set up square.

Would this fit ok with this low offset vs the OEM 29 and 23 offset? Or is the difference too much?

Also, what would the max/min offsets likely be so that spacers are not required? Could not find any info on min and max offsets that may fit without modification.

Thanks!
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      12-31-2012, 02:50 AM   #2
Kalidian
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You'll have more luck in the M3 forums.
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      12-31-2012, 03:30 AM   #3
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Maybe this will help you its about Oem/aftermarket wheels with different size spacers and tyres.

http://www.m3post.com/forums/showthread.php?t=262054

Seems to me that most people there choosed something like 15mm spacer with oem 18x8.5 et29= 18x8.5 et14, but with 245/40/18.
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      12-31-2012, 11:12 AM   #4
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+1 about using 245/40R18 as opposed to 245/45R18.

Tires http://www.tirerack.com/a.jsp?a=AH8&...ires/index.jsp
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      12-31-2012, 12:00 PM   #5
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Quote:
Originally Posted by Gary@TireRack View Post
+1 about using 245/40R18 as opposed to 245/45R18.

Tires http://www.tirerack.com/a.jsp?a=AH8&...ires/index.jsp
Hi Gary,

Would I be able to get away with 245/45/28 with et15?

Or will the front tires rub?
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      01-02-2013, 12:09 PM   #6
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Quote:
Originally Posted by jc824 View Post
Hi Gary,

Would I be able to get away with 245/45/28 with et15?

Or will the front tires rub?
Since the 245/45R18 tire is taller than we've tried, I cannot recommend it.
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      01-04-2013, 02:14 PM   #7
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www.willtheyfit.com may help u
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