If you're wanting modern radial tires, you're going to have to swap rims. They don't make the 17.5 tires in a modern radial. You'll probably either need to go with a 16, 17, or 18 inch wheel. I don't have a BFG catalog handy at the moment (it's at the shop), I do know that the All Terrain KO tends to come in wider sizes than what these old trucks came with originally.
