Is Offroading in a SuperDuty Really That Bad?

Mack M

Active member
I thought a 60-40 weight distribution was pretty typical of gas trucks, but it's hard to find this info. If your truck is 6500lb curb weight, this would mean 3900lb on the front axle, and 2600 on the rear. So adding 3200 to the rear axle would get you to 2900 per tire.
Ah right, duh, the truck weighs something. That was the stupidest comment I’ve ever left haha.
 

Mack M

Active member
Our F250 weighs a hair over 6500 with just me in it. Fully loaded with the wife, dog, camper, mtbs, and whatever other crap we have is 9560 with 4420 on the front axle and 5140 on the rear. That's about as heavy as we get. I'm assuming the OPs truck GVWR is 10600 so technically the 35x11.5 may work but it doesn't make sense to buy a truck with a payload rating to carry a camper and then put a lighter tire on it.
Yep, you are exactly right! I’ll stick with E loads, just might have to change tires. Will see, will call Falkena nd discount tire on Tuesday. At the very least, valuable lesson learned: don’t trust discount tire’s website specs haha.
 

Todd n Natalie

OverCamper
Yep, you are exactly right! I’ll stick with E loads, just might have to change tires. Will see, will call Falkena nd discount tire on Tuesday. At the very least, valuable lesson learned: don’t trust discount tire’s website specs haha.
I think your truck looks great with the 35's. Honestly from the factory, the HD trucks that come with 17' wheels look under tired to me.

I'm running 35x10.5r20's on my factory wheels.

I never noticed a difference in noise. MPG? Probably worse? I had the tires put on when the truck was pretty new so can't compare.

I'm getting about 20 MPG now and I'm fine with that,

Larger diameter tires will also give you a little extra ground clearance as well.

I went with Toyo AT3's in load range E.

(No D available in that size and I wanted something a little more stout than the factory P rated tires for trailer towing duties.)


level.jpg
 

Mack M

Active member
I think your truck looks great with the 35's. Honestly from the factory, the HD trucks that come with 17' wheels look under tired to me.

I'm running 35x10.5r20's on my factory wheels.

I never noticed a difference in noise. MPG? Probably worse? I had the tires put on when the truck was pretty new so can't compare.

I'm getting about 20 MPG now and I'm fine with that,

Larger diameter tires will also give you a little extra ground clearance as well.

I went with Toyo AT3's in load range E.

(No D available in that size and I wanted something a little more stout than the factory P rated tires for trailer towing duties.)


View attachment 836311
Nice!
 

Mack M

Active member
For those that care: I spoke with Discount Tire managers today, as well as an Engineer at Falken.

Discount tire does not base tires off of the manufacturer's requirements (this is bizarre) but rather the vehicle manufacturer. So Ford says a 35x12.50 can fit on their 7.5 wide steel wheels. Falken however, said that the tires were dangerous and need to be replaced immediately.

Nonetheless, I'm going to forego an inch and change to the same tire in 285/75/17 which is 34.1 inches in diameter rather than 35.1. Which is fine.
 

rruff

Explorer
I call BS on the Ford says part. They should have just said their numbers were an industry range without getting into specifics.
Discount tire does not base tires off of the manufacturer's requirements (this is bizarre) but rather the vehicle manufacturer.
BS on both. I'm pretty sure that Ford doesn't spec 35x12.5r17 on anything, and DT going by Ford (with rim not specified) makes zero sense...

Never seen a 35x12.5r17 tire that says a 7.5" rim is ok. 8" is the minimum. Note that "35x12.5" tires are always measured on a 10" wide rim, so they aren't really very wide since most people put them on a 8-9". Figure about .4" of tire width per 1" of rim width.

285/75r17 will be fine.
 

phsycle

Adventurer
BS on both. I'm pretty sure that Ford doesn't spec 35x12.5r17 on anything, and DT going by Ford (with rim not specified) makes zero sense...

Never seen a 35x12.5r17 tire that says a 7.5" rim is ok. 8" is the minimum. Note that "35x12.5" tires are always measured on a 10" wide rim, so they aren't really very wide since most people put them on a 8-9". Figure about .4" of tire width per 1" of rim width.

285/75r17 will be fine.

I believe the Raptors (both F150 and Bronco) come with 35x12.5x17 (or 315/70/17). But the rims are 8.5” wide. Fairly certain they do not come on any factory rim with 7” width.
 

MR. ED

Observer
For those that care: I spoke with Discount Tire managers today, as well as an Engineer at Falken.

Discount tire does not base tires off of the manufacturer's requirements (this is bizarre) but rather the vehicle manufacturer. So Ford says a 35x12.50 can fit on their 7.5 wide steel wheels. Falken however, said that the tires were dangerous and need to be replaced immediately.

Nonetheless, I'm going to forego an inch and change to the same tire in 285/75/17 which is 34.1 inches in diameter rather than 35.1. Which is fine.
Mickey Thompson Baja Boss come in a 35-10.50-17 with a E rating. Nice truck
 

phsycle

Adventurer
^^^ The actual size is 285/75r18 (8" rims are fine). Not a 35x12.5... which usually specs a 8.5-11" rim.
This is correct. Super duties come with 35s on an 18x8" rim.

Yes, 18x8


And also correct they come 285’s, which are ~11.5”.

So I’m not sure why Ford would unnecessarily put out a statement that 7” rim would work. I’m guessing it was hearsay from a friend’s cousin’s second nephew who worked as a parts runner at a Ford dealership.
 

tacollie

Glamper
I read on another forum that a lot of the big tire chains have their own generic size chart they follow. It would explain the OPs experience. Being that I read it on the internet I'm sure we can all trust that it's true🤣
 

Buddha.

Finally in expo white.
For those that care: I spoke with Discount Tire managers today, as well as an Engineer at Falken.

Discount tire does not base tires off of the manufacturer's requirements (this is bizarre) but rather the vehicle manufacturer. So Ford says a 35x12.50 can fit on their 7.5 wide steel wheels. Falken however, said that the tires were dangerous and need to be replaced immediately.

Nonetheless, I'm going to forego an inch and change to the same tire in 285/75/17 which is 34.1 inches in diameter rather than 35.1. Which is fine.
This is the reason I went from 17’s to 18’s on my 2500. I like the look of the 17’s but you cant find many skinny 35’s on 17’s. 18’s was the easiest way to fit narrow 35’s (285/75r18) on my stock Chevy with the small wheel wells.
 

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