I have a stock Nissan Xterra 2000 and I’m just wondering what size all-terrain tires I can put on there?
Dozens of members of this forum, myself included, have run 33x12.5x15 tires on the stock wheels with no issues.31" are pretty safe. The factory rims are only 15x7 so you will probably not want to go bigger than 31 on them. 32 requires trimming on many, and a PML for the front, and you might rub still. I run 32s on Cragar 15x8 rims with 4.75 backspace and I had to trim and grind some metal on my 2000 to eliminate rubbing.