I agree on the lines for racing and track the 18" rim has a better choice and more of a selection for what you can run for tires. You can run a better side wall for autoX and track racing in my opinion specially if your car is lowered. They also can run a few bucks cheaper, rim and tire. Then top that with the weight savings of a 18" rim over a 19" rim which i.e. the Enkei RPF1 in a 19x10 is 21.30lbs and the 18x10 is 18.45
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If you swing a 5lbs weight in you hand in a 1 foot circle it's pretty easy and fast rpms. Swing the same weight at your max arm extension and it can pop your shoulder out of its socket trying to go to fast.
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synolimit....
really.... That answer would fail you in Physics pertaining to the physics of a wheel. And this is were you get your participation medals thanks for trying.