I currently have XD Monsters, 18x9, +18 offset and 5.71 Backspace. Tires are General Grabber AT2 P265/70r18. I have Billies @ 2.5"
I had to trim the front fender slightly and I was getting slight inner sidewall rubbing on the chassis. No rubbing on UCA. There was a 1/4" of space there. I added a 1/4" spacer plate and that solved the inner sidewall rubbing.
I want to get BFG ATs. I had my mind made up to get 275/65r18 as they are pretty close in side to my Grabbers. I shouldn't have to do any more trimming. But deep down I want 285s. But I really think it would be a very tight fit. If I had those wheels in a -12 offset, I doubt I'd have any issues. I don't think my current rim will allow for a 285 comfortably. Based on my research, my Grabbers have a 282mm section width on a 9" rim. The 285 ATs would have a 297mm section width on a 9" rim. Thats a 15mm difference, or 7.5mm on either side, ie, 1/4". But I know math translated to real world application doesn't always jive.
According to the manufacturers specs, my Grabbers are slightly taller than the BFG 285's. Its just hard to figure the difference in width on the rim.
What do you guys think?