Tire size

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Jan 3, 2011 | 07:23 PM

deere55

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From: Ohio

Tire size

What are the largest tires that will fit on a 1991 F350 4x4 stock rims and stock height?

Specifically with mud or all terrain tread.

Jan 3, 2011 | 08:24 PM

IDIDieselJohn

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From: Ottawa, Ontario

On the stock rims I think you can't go wider than 285, height I think, but I could be wrong, 33"

Jan 3, 2011 | 08:55 PM

deere55

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From: Ohio

Ok, well forget about the rims, but what's the maximum size tires you can get under there without lifting the truck? 33 x 12.5s?

Jan 3, 2011 | 09:34 PM

threefiftyone

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From: Oregon

I have personally seen 315's on a lot of factory rigs with 8" wheels. Biggest I've ever had with no problems has been 305's (33's)

Jan 4, 2011 | 09:28 AM

jokerforever

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I just put 35/12.5/17s on my 97. No lift, but a good bit of triming to the front bumper. The 91s use a different bumper and I've heard that you don't need to trim as much if anything from them. The key is the offset of the wheels. I made a mistake and got wheels with too much backspacing. You want to look for something with 4"-4.5". This will make your tire stick out a little with 8" rims and a lot with 10" but if you go any closer you will rub the tires on the springs.

As for stock wheels, I was running 285/75/16s on the stock 7" wide rim without problems but I would suggest a wider wheel if you can get it.

As for the max tire size, I've seen pics of someone on here running 37s. He had to pull his bumper and fab a new one but he said that they fit without rubbing with no other mods. I would think it would be the same as my truck. A lot of neg offset to get the tires away from the springs, then making clearance to the sheet metal as needed.

Jan 4, 2011 | 11:10 AM

deere55

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From: Ohio

I've been considering 305/70/r16s or maybe 315s. I just wanted to make sure that they would fit before I had to make the venture even more expensive. Is an 8" rim enough for 12.5s?

Jan 4, 2011 | 03:02 PM

hav24wheel

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From: North Dakota

10 would be better

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Jan 4, 2011 | 04:29 PM

jokerforever

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Quote:

Originally Posted by deere55

I've been considering 305/70/r16s or maybe 315s. I just wanted to make sure that they would fit before I had to make the venture even more expensive. Is an 8" rim enough for 12.5s?

Check with the tire manufacture. Most manufactures are similer but every now and then there is an odd ball thrown in. Here are the specs for a Firestone 315/75/16

Firestone Destination M/T

If you look at the "Rim Width Range" you can see that an 8-10" rim is fine. I'm running my 35s on a 8.5 rim and they fit great. Take note though, a tire will be taller and narrower than the same tire mounted on a wider wheel. It may not be much but it can be the difference between clearing and not clearing. Me personal, I think a 35 looks better mounted on 10" rims than anything else and when I get back in the market for a set of wheels with a better offset I'm going to try to find a 10" rim.