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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 > Stupid question ..



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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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      10-06-2008, 11:29 AM   #1
Chitown-Irish
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Stupid question ..

How do you determine the diameter of a wheel?

Is it measured from outside edge to outside edge?

Also can 18" tires be mounted on 19" wheels?

Please be kind and don't flame me.
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      10-06-2008, 12:06 PM   #2
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I think the best way is to take the diameter measurement from the inside groove that the tire sits on. It’s easiest to measure the inner diameter of the tire after it’s removed from the wheel.

I am no 100% on the 18in on 19 inch, but I am pretty sure thats impossible. Low profile tires are hard enough to mount as is, trying to stretch an 18 on a 19 probably wont work.
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      10-07-2008, 11:15 AM   #3
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Or just look at the back of the wheel as it should be stamped there.
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