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A little more specific, are you lowered and if so how much? Stock wheels? What size are your wheels? I take it your car is AWD and you can do a 235 no problem, but 245-255 would be intense for the fronts.
On a rear wheel drive, you can easily run 245's in the rear, but the front would rub, as 1sicklexus stated. There's an inside suspension piece that sits about 1/4 inch from the side of the front tire/wheel, it prevents you from going much wider (but you can go a bit taller) larger than what you already have.