Well you asked how wide you could go on a 9" wide wheel. You did not say you were staying with the same width which would change the overall diameter(if you went with a wider tire) right? Then you might have an issue with the 18" wheels, especially with the car being lowered and by how much? That's why I suggested the forum for the year of your car as you would most likely find guys with what you are trying to accomplish there. When I asked about 275/40-17's up front I was told they would fit and with really cranking the steering wheel I would keep the swat bar clean! LOL Also a 20" wheel with the same outside diameter as on a 17" wheel would have it's limits. What would be the sidewall of a tire with the diameter of the 275/35-17 you mentioned? I came up with a sidewall of almost nothing, 20mm I think. Check my math there would you? Anyways hope it all works out for you. Try checking out the look of a 315/35 from the back on a Stang! I love wide tires! Mark

 

275's fit on a new edge, thats what i run and my front has been lowered a full 1.5". i have very slight minimal rubbing when i fully turn to the right which i only do occationally when i park. its just the edge of the tire rubbing on my sway bar. no biggy at all, and it very rarely happens. 275's max up front and 325's max out back. period

 

Thanks. Let's see if Santa can bring me 4x BFG-KD's 275/35R17 =)

 

i have a 94 gt with saleen wheels on it18x9 on the front with a245/40/18 and the rear 18x10 with a 295/35/18 i have no problems clearing these tires