I just ordered a set of 315-75-16 for the dually. I am currently runing 295-75-16 with no problems. I think it has 2" spacers. Everyone is telling me there is no way a 12.50 will fit on the stockers but I know I have seen them running around town. And tricks to running them or willl they just not fit ?

 

Personally I don't suggest putting big tires on truck unless your willing to lose MPG's over it.

As for spacers be careful that you have enough stud to fasten the tires properly to the axle.

 

You can put them on the stock rims. They may not fit properly but you can do it. Just make sure the duals do not rub each other. You also may wind up wearing the center of the tires out quicker than the edges because of the crown of the surface of the tire.

 

ok thanks for yalls input! Not to worried about mpg's that much, I used to have a 6.0 powerstroke that got 13 mpg so I am used to crappy mileage