I have a set of four 39.5x13.50-17 Irok bias tires I might be interested in trading for a set of 39.5" Swampers or Boggers for a 15" rim. Tires are off a buggy-type vehicle, so basically zero road miles and probably 75% tread. Some rock rash, and the outer lugs have some wear from spinning on rocks (typical for Iroks). No plugs or patches. Located in central Ohio area. I'm on the verge of buying 17" wheels and using the Iroks, so let me know soon if anybody has any interest.