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wow.........that's actually an interesting question.
one factor would be sidewall stiffness. if the sidewall is too soft, the tire would "deflect" or "rollover" and reduce the amount of tire on the inside that is in contact with the road. i guess we should just assume Z rated tires for comparison purposes. increased tire height results in more grip for straight line purposes though, and vice versa.
i really don't know........but if i had to give an answer, i'd say reducing tire profile (to a point) is more beneficial. i say this because i get assessed 2 points for increasing rim diameter, but only 1 point for increasing rim width. but then you get into the whole argument about heavier wheels.
anybody else? mark? dave? bbp?
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