I went from autocrossing on 17s to 16s to my current set up with 15s. And progressively the feel and transitions from 17s to 15s was much better. The acceleration and braking alone is amazing staying with 15s. Plus more performance tires come in 15s (for Civics) than in 17s. And most 17" wheels and tires weigh about 40-45lbs, whereas my 15" wheel/tire package is 32lbs.
And since 1lb of rotational mass is equal to 8lbs. I basically shaved off 80lbs per corner or 320lbs total static body weight.
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