They will be smaller overall diameter so they will throw off your speedo.
I bought a set off base 2wd tacoma wheels for about 150 shipped and 215/70 15 winterforces and they have been fine. I may switch to general artimax because I have heard they are good. 215/70 15 is the base 2wd taco size so it has the same overall diameter as the x runner.
I run studded tires for ral