ive heard 275 is as big as you can go on the front man... i have 255's and they dont rub but theres not much room left at full steer. 285's would make your car handle like a nascar, dont do that. Saleens come with 265's and ive heard thats about as wide as you can go without terrible handling. the 295's will be fine out back... im actually looking into 315's for the rear when i get a supercharger. good luck!
I have 18 inch AFS '03 Cobra Wheels with Toyo Proxes tires and up front they are 275/35ZR18 and in the back they are HUGE 295/35ZR18 - AFS Wheels recommended that's the biggest you go up front. By the way I think the '03 Cobra's come with 275's all the way around on 17 inch wheels.
you can have up 315/35/18 at the rear but i recommend only up to 265 at the front or you will have rubbing and steering/handling issues.
i have 265/35/18 front and 295/35/18 at the rear
you can have up 315/35/18 at the rear but i recommend only up to 265 at the front or you will have rubbing and steering/handling issues.
i have 265/35/18 front and 295/35/18 at the rear
Just got the front two of my 18" wheels set up today, 265/35-18 Yokohama AVS Sport. It's a 9" wide rim and it's a perfect match, the sidewalls are nice and flat.