I have searched and searched more threads and cant come to a conclusion.

I have a 2000 250 Superduty Diesel crew SRW 4X4 with 68k.

I need to replace the stock 265/75/16 E tires.

What is the max size I can put on with NO rubbing, modifications?

I want to fill the wheel well to improve appearance.. BUt I do tow a 10,000 pound Boat in the Summer months, a few times a month.

what about with an 17 or 18" wheel? any mods needed? I unerstand there would be with these size wheels...

Thanks guys I appreciate the help and love this forum even though I lurk most the time!

 

I'm running 285/75/16's on my stock 7" rims. Personally, I wouldn't go any wider without going to a wider rim. I know a lot of guys do, and report no problems... it's all what you are comfortable with. A larger diameter rim would be nice for towing, but you'll have less tires to choose from right now. But more and more tires are coming out in the 17 & 18" sizes all the time. If you do go with different rims, make sure you get the correct back spacing, and you'll probably also want to make sure they are hub centric vs. lug centric. The weight of the super duty trucks is designed to ride on the hubs, not the lugs.
Also keep in mind that a larger diameter tire will affect your towing performance a little.

 

I recently upgraded to 325/60/18s, on 18x10" rims. They do rub slightly sometimes but its only when I am backing up and turning sharply. I can turn the wheel all the way to lock left and right going forward with no rubbing. The tire height is somewhere between 33" and 33.4" depending on what tire size calculator you use.

If you stay smaller than that, and you get a rim that isnt 10" wide, you should be ok.

 

I've seen 285/75/16 on 16x10 wheels.

 

Ive got BFG 295s on stock wheels and haven't had a bit of trouble.
Well thats not entirely true..........The power steering pump has a hard time turning them when still.

 

Thanks guys...

 

I have the 295/75 Nitto Terra Grapplers on my stock rims and love them. No rubbing and a great looking tire with no noise.

 

I've seen 35's on stock rims. Not sure about rubbing though but they looked awesome.

 

I have the factory 275/65/20's that are 34.1"tall.It is an F-250 w/10,000gvw.