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The unsprung weight (wheel, tire, brake, spring, strut/shocks, hub, suspension links, etc) is nearly 100lb per corner in the front, and about 90lb per corner in the rear. Therefore, reducing the unsprung weight by only three, four lb per corner can hardly be felt. (You would do this primarily for changing appearance, and not for any preformance improvement.)
I have a set of Enkei RPF-1 16x7 running on 18lb 205/55-16 tires, and 2-piece front brake rotors (saving another 5lb each). I also use Muteki open-end lug-nuts, each weighs only 25 grammes. In my case, the reduction in unsprung weight is noticeable, and for the better. With OEM springs and shocks, and lighter (Cusco) anti-roll bars, the car drives more like a classic Alfa or Lancia: much more finesse than brute power.
But if you up-size the wheels to 18" and run super-wide tires (225 or more), the deterioration in handling, ride comfort, and acceleration may be quite
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