Ok, so I got a new set of tires for my truck. I got some 33x12.50R20 for my f-150. Oh yeah I traded my stock tires for these new nitto mud grapplers . Right now I am running 325-60/20 on nitto terra grapplers the truck and they did not fit so I have a spacer in there. My question is, will those new 33's fit on the wheel without the spacer. I was told that with my 3" level kit that those 325-60/20's would fit fine, but they did not. So, does anyone know for sure that these mud terrains will fit??!!

 

They should fit but you may still want to keep those spacers around. It all depends on the backspacing on the rim.

 

It is the stock 20inch rim

 

In order for you to run these tires I believe that you need a +18 offset which is very close to the 5.5" backspace on the stock rims. so you should be able to run the tires on the stock 20's with no problems.