I will be purchasing a new set of wheels/tires within the next couple months (maybe sooner if i can get the financing) and am pretty dead set on 18s. My truck is a stock height ext. cab f250HD 7.3 it dos not seem to sag at all. What backspacing/Offset works the best? and whats the biggest/best size tire to run? I plan on trimming the front bumper as much as needed to make em fit. I have checked numerous of threads/pictures and alot of photos dont have info on rim/tire size/offset/backspacing etc. So any pictures of ya'lls trucks with 18s and 33" tires or equivalent tire size would be awesome. Please list specs on the rims/tires.

 

What gears do you have in the diffs and what do you plan on doing with the truck? If you pull a lot of loads, you'd best make sure whatever tire and rim combo you get will support a load.

 

It has 3.55s, i dont tow anything at the moment just haul around a couple hundred pounds every now and then of tools. Eventually in a year ill have a toy and trailer (roughly 6k pounds at most). Power wise it wont remain anywhere near stock ( PHP 6 position chip, downpipe will be ordered here in a week) and eventually all the other goodies that follows. The main concerns are rubbing (i dont mind if it rubs at full lock) but obviously the less rubbing the better. And as stated i dont mind trimming the bumper which i will probably have to do to fit 33s.

 

Whether or not you will have do will show when you try to put the tires on. I've seen cases of both.

However, you may want to find a truck with 4.11 gears to swap over unless you do a whole lot more highway driving than you do city. It'll also help in low end torque.

To avoid rubbing on 33"x12.5" tires, I've found that a backspacing between 4" and 4.5" on a 10" rim is usually satasfactory. The closer to 4" the better. You should safely clear the leaf springs that way. But if trimming the bumper doesn't bother you, you'll be alright.

 

Gotcha, a D60 swap will eventually be done along with sometime of lift but that wont be done for awhile as i have no issues with the TTB at the moment so i will be staying at stock height for awhile (investing the $ in go fast goodies). 90 percent of my driving is on the highway, i run about 1900 RPMS at 68-70 mph so the rpm drop would be nice. I plan on getting 18x9 MB wheels from discount tire as i get a good discount on them along with tires. How dos a 325/60r18 fit? Thats what i have been looking at tire size wise ( 33.3"s for height and 12.8"s for section width). I know it will fit on the wheels just fine but will the extra little bit of width over 12.5"s really cause that much issue for rubbing? I appreciate the help!

 

If you do that much driving on the highway, I wouldn't worry about gears too much. You shouldn't have too much of an issue with clearance if that's all the bigger the tires are. Just be sure to get an appropriate backspacing. If I were to guess, a 4" backspacing would still be adequate with those tires. You may still have to trim the bumper, but you shouldn't have issues with rubbing that way.

 

You should't have any issues with fitment of the 33s. You may have to trim the bumper a very little bit or space it forward 1/2", but you shouldn't have a difficult time. I know of a stock 1996 F-250 near me that runs 36.2" (real measurement, supposed to be 37s) diameter tires with a custom front bumper.