19" will be another step up in ride firmness from 19". Most don't find it too harsh, but some do...so you might want to find someone with this setup and ride/drive their car first before making such a large investment. 235/35R19 is the front sizing. Rear is 245/35R19 or 265/30R19. With a sedan you may have to have the rear fender rolled to accomidate the wider tire sizing and more aggressive wheels.
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