What size tires can fit???

I have a 2007 Toyota Tacoma sport 4x4 LB and I have what I believe is a 4in lift on it. (bought the truck with the lift already on it.) My truck has max trac knuckle on the front suspension. I have 265/60r18 tires on the truck now with 18x9 ultra maverick rims. I want to put 275/70r18 on it but with my tires I have on it now, I have about 1 1/2inches of space between the inside of the tire and the knuckle. FYI it does not rub at all right now, not even at full lock when turning. I was wondering if you guys think I could fit the 275/70r18 without a spacer. Sorry if I didn't explain that well. New to all of this.

 

Try the search in this thread in the meantime -> https://www.tacomaworld.com/threads/tire-and-wheel-fitment-guide.405262/

I use google a lot, and just add tacomaworld to the search.