01-04-2013, 07:05 PM
Worlds Foremost Authority
Location: Upper East Side Manhattan - Lime Rock CT
Join Date: Jul 2007
Mein Auto: 2015 M4 Convertible
A rim size comparison is only going to be valid if we are comparing the same model rim and the same model tires in different sizes but I agree it would have to be trial and error with the tests made on the same car, with the same driver and under the same conditions to be conclusive.
Originally Posted by Jamesonsviggen
All valid and good points.
Your race team was likely comparing a light set of 18's to a light set of 19's.
The BMW 18's that came on my car were nearly 27lbs. The "semi" forged wheels I bought are 22lbs(rears are more like 24lbs. I could have spent more and bought 18-20lb 19" wheels. Then factor in further weights savings by careful tire selection. The weight savings may be enough to counteract the sidewall attributes you brought up.
We may be getting to the point of splitting hairs where trial and error would have to reveal which would work better.
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Last edited by captainaudio; 01-04-2013 at 07:06 PM.