16" & 17" wheels, what tires fit?

I have a 1996 explorer sport 4x4 with torsion twist and shackles. I am interested in upgrading my wheels to a newer model. I have been looking at some 16" and 17" wheels that I like. I am looking to get a set of the BFG all-terrains along with new wheels, and I'm wondering what the largest size tire that I can fit on either the 16" or 17" wheels without rubbing. Any information or suggestions will be much appreciated.

thanks