265/70R17s usually fit without too much heat molding of the front fender liners, and usually fit in the spare tire well. But tires vary in actual size. Tire Rack publishes measured sizes. Wheels with more offset will make the tires rub more.
KO2s run small for their nominal size. The 265/70r17 Falken Rubitreks I put on would not fit in the spare well with the Lexus class IV hitch. I ended up putting KDSS spacers on the anti roll bar which made enough room. Someone else here has exactly the same tires and wheels I have and had no problem. I also had to heat hold the front liners a few times to get all the rub out.
Yeah it's one of those things where we can't be completely certain as manufacturing tolerances really dictate what fits and doesn't fit. I had 265/70/17 Rubitreks as well and they fit without any mods. Barely, but they fit. Anything under these are almost sure to fit, but yeah.