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Check the pics^, 225/45/18 on the front, and 255/40/18 on the rear, no spacers. You can run some 265/40/18 on the rear if you want, but they will rub just a little depending on ride height.(10 minuets with a fender roller will fix that)
I wouldn't go any wider than 225 on the front without dropping the the sidewall to a 40 series.