18" BBS MAXIMUM Tire Sizes With minimal lift/no lift?

Just wondering what the largest possible all terrain tire I can squeeze in my fenders on my Stock 18" BBS wheels with NO lift at all and (in the slight chance I lift it) with 2.5" lift up front and 1.75" lift in rear? (Minimal to NO fender trimming please)

What are y'all's thoughts?

Most likely go with BFG AT KO's. I've had them and I like them. Just need to know this.

 

265/65/18

 

Is this the best (tallest/widest) option without any suspension changes or fender trimming?

 

i had 265/75/16 before my life. only rub was on front mud flaps which i took off and then i lifted my truck

 

I have the 18" BBS RW's with 275/65/18. Toytec CO set at 2.5". No trimming, very slight rub at full lock in reverse.

 

265/65r18 = 31.6X10.43 Which makes sense to me that it'll fit stock
richardbui23 265/75r16 = 31.6X10.43 also
Same dimension tire, except for the rim size. Looks like that's what I'll go with.
Wish I could afford a lift. Love that 2.5" set up.
Hopefully 265/65r18's on 18" BBS RW's will not tear up my fenders. Although I don't mind trimming my fenders. But, I doubt there will be any chance for a refund for a smaller tire once it's installed if they're just crazy big.. any thoughts?