So, as per this:
http://www.caranddriver.com/features...d-tires-tested
It appears that depending on the car, lateral grip will be maximized at a certain wheel size, and will actually decrease beyond that point.
I had plans of running these 20x9 A8 W12 wheels with 275/35/20's on my Allroad, but am now wondering if 18x8.5 RS6 or 17x8 A6 S-line wheels would provide better lateral grip. I understand that unsprung weight will affect handling, but I'm more so interested in what will achieve maximum lateral grip, given the same brand and model of tire.
For reference sake, Audi ran 255/40/17 and 255/40/18 correspondingly on the 17x8 and 18x8.5 wheels from the factory.
For arguments sake, lets say I'm choosing the Michelin Pilot SS.
Does anyone feel like weighing in with some nasty physics to help educate me on this subject? I always thought that a wider tire would equal more grip, but that doesn't seem to be the case.
Aesthetics don't matter too much to me, as both sizes of this wheel look fairly good:
20x9 D3 W12 S-line Wheels
18x8.5 C5 RS6 Wheels
17x8