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Stumbled on this site after hearing about it for years from buddy at work...so lets give it a try.
I have a '06 Ford F350 - Black loaded - I want to put some beefy tires on it although I don't want to lift it. Anyone know what size of tires (mudders? pro comps?) I can fit on this truck without having any turning or driving problems? I have 20" stock rims
Your help is greatly appreciated
da'boys
 

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Your stock 20" tires are already "beefy". They are only a hair shorter than a 35" tire. So maybe call it a 34.75"?

The problem with going much bigger is your expensive stock wheels. They are only 8" wide, and Ford mounts almost the biggest tire that will fit on an 8" wide wheel.

Your tires are LT275/65R20. You could move up one size to LT285/65R20 and still get by with 8" wide wheels and probably no rubbing when turning. 285s are one-half inch wider than your stock tires, and a hair taller (less than one percent taller). If your objective is LOOK AT ME! tires, then only a diehard enthusiast would probably notice you had more than the normal 20" tires on your rig.

But bigger than 285s and the profile goes down to 60 or less - resulting in a wider but not much taller tire.

For example, BFGoodrich makes an LT325/60R20 AllTerrain. It requires a minimum of a 9" wide wheel, and has 586 tire revs/mile. The stock tires have 605 revs/mile, so the wider 325s are 3 percent taller than stock tires. Probably not enough taller to notice. But a lot wider: 13" for the 325s compared to 11.27" for the stock tires.

Will they rub without a lift? Probably. It would depend on the exact specs for your new wheels. And I hope you have enough sense to not mount tires that require a 9" wheel on an 8" wheel. /ubbthreads/images/graemlins/cool.gif
 

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I just put 285/65R20 BFG ATs on my 2008 F-350. These are on the stock King Ranch 20"s. No rubbing that I can see. I may put some 2" spring spacers on the front to level out the truck. This will have the added benefit of more clearance. The BFGs are 34.7" and 599 revs/mile. I believe the stock Goodyear ATS tires are 34.1" and 609 revs/mile.

Later-
 

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Somone on here once said they put 325/65/18's on there stock height truck. f-350 with snow plow package if i remember right. can someone confirm this???
 

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I have 325/60R18s on my stock 07 F-350 with the plow package......325/65R18s look like they may fit, but it would be tight.
 

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They are both 12.80 wide with the 65 profile being 1.28" taller I can't imagine it being to much tighter. Hmmmm I would love to put 325/65/18's on but I need someone to confirm they fit first.
 

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On an F350 with the "Camper" and Snow Plow Prep" packages a 35x12.5x18(or 20) will fit with no rubbing and there was a guy on here running 37" with none as well. This is on the stock 8" wheels and requires a true 12.5" tire not the metric equivalents that are actually wider. Also running wider tires on wider wheels could be a problem.
 

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If the 325/65R18s were available in my tire I would have probably tried them out /ubbthreads/images/graemlins/grin.gif




The 325/60R18 comes close to the inner fender liner....never really paid attention to the bumper clearance.
As I said...I would imagine that the 325/65R18 would fit under there on a stock wheel......not 100% sure though.
 

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At almost 13" wide a 325 is too wide for the stock 8" rims. No tire manufacturer oks mounting them on a rim that narrow.
 

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[ QUOTE ]
At almost 13" wide a 325 is too wide for the stock 8" rims. No tire manufacturer oks mounting them on a rim that narrow.

[/ QUOTE ]
I understand that. I will be putting a 9" or 9.5" wheel on the truck with 5.5-6" of back space. I was just curious if the 325/65 tire fits. /ubbthreads/images/graemlins/cool.gif
 

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I have some Mickey Thompson ATZ 325/65/18 on Weld 18x8.5 w/4.75" backspacing and 0 offset. There is NO way to run this particular setup without a lift so I got the DR 4.5" lift.

I have some pics if you want them when I did a test fit when I was stock.
 

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one of my friends brother has 35" toyo mt's on the factory 20" rim. i dont know the width, but i will try and find out.
 

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[ QUOTE ]
I have some Mickey Thompson ATZ 325/65/18 on Weld 18x8.5 w/4.75" backspacing and 0 offset. There is NO way to run this particular setup without a lift so I got the DR 4.5" lift.

I have some pics if you want them when I did a test fit when I was stock.

[/ QUOTE ]I would love to see the pictures. I clicked the link in your sig and it said 404 not found.

I thought all 05 and up trucks had to have 5.5-6" back spacing? Is this maybe why your wheel/tire set up didn't work?

Where was it hitting? On the bumper?
 

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Really old thread but popped up for me.
I just put 37/12..5 r17’s on my 2” leveled truck, rubs a bit on the plastic fender liner on the driver’s side.
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