why 18'' wheels more popular on track?

wstar

During one of our advanced classroom sessions at the track this weekend, the instructor (who seemed quite experienced) had a detailed discussion with us about all things related to tires and rubber and widths and heights and tradeoffs. I'm still digesting half of what he said, and there's no way I could repeat it all anyways, but suffice it to say I came away from the discussion still thinking that 18x10 square is best for this car in the overall. You could potentially see some very small benefit from going wider (at least in the rear), but only if there's another reason for the tradeoff (e.g. to use up leftover points because you were under expected weight for your class or something) - although I'd rather buy aero than wider wheels, I think, in situations where that's an option.

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