[Palf70Step]

For most of our trucks, the max you are going to tuck under is something with a 4.5" backspacing. In Most states your wheels and tires must also remain within the wheel wells, so you are probably looking at an 8" to 9" wide rim. Tires, whatever is recommended for those width wheels will normally clear. Tire measurements are not always exact between brands. If you want to keep all the wheels the same, you are probably limited to 8" wide and 4.5" backspacing. I have not seen any larger width sizes used on the front that don't have issues with clearance.

I have two sets for my truck, both on 15x8 with 4.0 back spacing. For street use, 275x60x15 and other use is 31x10.50x15. No clearance issues as far as hitting, and the both combinations come even with the outer edge of the fender so they would be legal in all states from that perspective.

I goofed mine were 4.0 Back spacing instead of the 4.5 I originally posted