then there's no point in comparing a wheel/tire setup to one that doesn't satisfy the requirement.
Also some tires are heftier than others. The 255/40/17 595 RSR that I run on my track wheels are heavier than the 275/35/18 Hankook V12 Evo2 that I just got on my 18s. Combine that with a decent 18x9.5 FN01-RC vs a cheap Avid 1 17x9 and my "track" wheel and tire package is significantly heavier than my road setup.
That said I just piked up an 08 Cayenne Turbo for a daily, so the 17s will be going byebye and the 18s will be getting track tires.
-Dan
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