I own a 99 f150 4x4. I'm currently running 295/70/17 Nitto TG's on stock rims, without any rubbing whatsoever. I'm interested in getting an 18" wheel (sepcifically the Cruiser Alloy 921, which is 18x10, with -25mm offset, and 4.52" backspacing), and had seriously considered going with the Nitto TG's in a 325/60/18. This size is actually about 1/4" shorter, so I know the diameter won't be a problem. What I'm not sure about is the width. I know that the tire is about 3/4" wider, and I don't know how that would work out with the wheel that I have chosen. My stock wheel is the chrome 5-spoke. I'm not sure what it's dimensions are, other than I know it's a 17" in diameter, and I think it's like 7.5" in width. Thanks

 

I've seen it done. That setup will fit but you will have to trim some plastic off the front bumper's lower valance for clearance.

 

Thanks.. That's what I wanted to hear. I can handle that. Now I just have to come up with the funds!!

 

325/60/18 = 33.4 x12.8/18

you should be alright you could also crank up the torsion bars...

 

your current size
295/70/17 = 33.3x11.6/17
only an inch wider