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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 > can you guess my F offset?



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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
/
ASPECT RATIO
- WHEEL DIAMETER
ORIGINAL TIRES
/
NEW TIRES
/
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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      09-17-2010, 02:36 AM   #1
xxp0loxx
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can you guess my F offset?

I bought my car with 20" Beyerns (would rather have 19" ) and im looking to lower here shortly. Unfortunately the previous owner doesnt remember, and because im at work atm, i cant go pop off the rim to take a look. I'm asking because im certain one of you guys with your extensive experience with rims/stances could probably tell me by just discribing it.



20"x 8.5 rim, 245/30 falkens
when straight, the wheel sits completely flush with the front fender...no spacers. i believe the offsets available for this rim are 20, 30, 40 according to their website.



I have about 1 1/2 - 2" of clearance up front (from tire wall to fender). If i dropped using eibach/H&R would it cause the wheel to tuck behind the fender? All fenders have been rolled to compensate for the 20" rims. My main concern is dropping the front and sitting the fender on the tire lol. Anyways, i'll appreaciate your read and advice.
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      09-17-2010, 10:32 AM   #2
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To be sure on the exact offset you got, it is best that you remove the wheel and check to see what exactly the offset of that given wheel is. You should locate a reputable tire shop in your area to help you out with this if you aren't able to do it on your own.
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      09-17-2010, 10:41 AM   #3
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will do thanks )
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      09-17-2010, 02:14 PM   #4
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The fitment looks fairly flush front and rear. If you plan on lowering the vehicle it looks like you'll need a rear fender roll. I would recommend pulling the wheels off to check on the rear hubs for the width and offsets to be exactly sure.

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      09-17-2010, 04:16 PM   #5
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That would look to be right around et30 up front, but check the wheel still
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      09-18-2010, 05:50 AM   #6
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will do, thanks for the input guys!
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      09-18-2010, 02:24 PM   #7
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If those wheels comes in ET20, ET30 and ET40, my guess is ET30 in the front and ET40 in the rear, maybe.
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      09-18-2010, 02:26 PM   #8
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