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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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      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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