That's the point Jake, maybe there is, and maybe there isn't. But, w/o emperical data, you can't say for sure. And while the cornering forces may be the same w/ your tire example, there are other possibilities. With the greater variety of 15" wheels to choose from, it's entirely possible that you can get 15's that are lighter than 14's. Less unsprung weight, and possibly less rotational mass. I believe it was Darin that said that all else being equal, a 15" wheel will unshroud the brakes more than a 14" wheel.

Minor stuff, but possibly an advantage that could be exploted.

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MARRS #25 ITB Rabbit GTI (sold) | MARRS #25 HProd Rabbit
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