I believe the biggest that will fit is 305 and even that only certain brands. How much power does your car make? If it's stock, you don't really need that wide of tires unless you are just doing it for looks. As for the fronts, I have no idea if that would fit. I imagine it would. My 07 has 235. I've seen a 98 with 245. 255 is not that much bigger, it probably would fit. Wider tires will be worse in rain though. lol i guess you don't care though. It doesn't rain a whole lot in Kansas does it? I live in Vancouver and you'd think we lived underwater with the way the weather is today!