Please don't flame me for speakin out what I believe, but I have heard that a smaller wheel of the same weight as a larger-diameter wheel will spin up faster. Intuitively, this makes since since there is less mass to accelerate.
The problem with this is that a smaller wheel means a larger tire. You could end up with more or less mass to accelerate, or you might end up with the same or less.
I know from experience that a smaller diameter wheel will accelerate quicker because the mass is physically closer to the axis upon which it is being spun (the axle - where the centercap is).
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The FocusSVT wheels are nice and clean and I would get them if the wheel/tie combo was under $1000 (and I didn't already have aftermarket rims/tires).
Honestly, I don't think you will notice much difference (you might hear some difference in roadnoise or feel some vibrational difference on the steering wheel). Tires will make more difference than the wheels will.
BTW - it would help if you spec-ed your car so we could tell which 15" wheels you have =)
Have you put in your $0.02 to save contour.org?? Put in what you can spare to keep the site up. Check the General Forum.
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David
* 2k Black SVT on 17" Konig/Yokohama
* MB Quart all around; Alpine 7995, DEI/Alpine amps; Dynomat
Soon to come:
19" HRE 445s under GC/Koni Setup, Custom passive-AWD kit, 2 small Sequential Turbos running low boost, Sequential 6-speed, Widebody Kit, custom black-red chameleon paint; on and on...
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