I really hate to ask about tire sizes because there are so many posts about the subject but here goes. I presently have 325/60/20's on a 9 inch wide wheel on my 08 F250 4x4. I have just recently ordered a new 2013 F350 and plan to install 18 x 9 or 10 inch wide wheels. I would like to keep the height of the tire the same or close to the current 325's but would like to reduce the width about an inch. Can anyone give me a tire size similar to what I think I want.
Plan to go with the BFG Goodrich AT's.
Thanks

 

Go to www1010tires.com and search for their tire calculator.
You can also Google "tire size calculator"