first gen 275/18 on a 18x9

[MarkM66]

It'll fit, but the tire will rub the frame at full lock, thus effecting turning radius.

You'll probably want around 5.5" of backspacing. And this much bs will cause the wheel to hit the steering arm, unless you're running a short steering arm. I know it will hit with a 17" wheel, not sure on a 18".

Find CarlC's over on pt.com, and find his website. He's running 17x9.5 with a 275.