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Old 09-29-2012, 10:32 AM
sarends sarends is offline
Bimmer Lover
Location: Denver
Join Date: May 2005
Posts: 71
Mein Auto: e70, e36, e34
BMW Factory Wheel/Tire 19" vs 20"

Diameter 29" vs 28.7"

Sidewall 5.0" vs 4.3"

Circumference 91.2" vs 90.1"

Revs Per Mile 716 vs 724

So, the actual height difference is just three tenths of an inch (using the difference in diameter)

However, IMO, the perceived height difference could be more than this. One reason why I think the "perceived" height could be more on the 19" is the particular 19" tire could have been a little tippier than the 20". The sidewall of the 19" is 5.0" vs 4.3" - although this is only .7" it is .7" below the rim and .7" above the rim for a 1.4" difference in sidewall height, top to bottom. And, this is a 16% difference in sidewall height, which I believe is easily felt in the handling department.

I have the 19s, and although I love my 5.0 Sport AD, I do not like the wheel/tire setup - I don't think it is anywhere ideal (yet). I plan on "firming" up my car's handling with a) different tires on the 19s beginning with non run flat UHP Vredestein winter tires and b) purchasing 20s this spring.

In this case what is perceived is for all practical purposes, reality
11 X5 Xdrive 5.0 Sports AD
97 M3 Sedan
95 540i 6 Sport
12 Powerstroke Diesel

Last edited by sarends; 09-29-2012 at 10:34 AM.
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