TIRE SIZE MISMATCH

[BuiltToWork]

EDIT: Oops posted in wrong section - I should have posted in "Exteriors" - sorry about that...newbie
(see attached pics)
On the truck I just bought the front tires are 235/85 r16 and the duel rear is 245/75 r16
Ok, so google search for height calc:

7.9" vs 7.2" height


Q1: Is my x-fer case or diffs damaged from rotational speed difference? I'm sure the pervious owner drove it in 4WD based on tire wear.

Q2: The factory manual says the size should be 245/75r16 but has an option for 265/75 for the dual rear end. Does anyone run 265/75 and if so, what do you think of them? Any advantage/disadvantage aside from the slight width difference?

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[bucket]

The front tires appear to be much older. My guess is that the front tires are what the PO was able to get ahold of the cheapest and fastest, when the previous tires were worn.

The transfer case won't be very happy about the size difference on hard surfaces, but snow and mud will provide enough slip to save it.

 

[AyWoSch Motors]

EDIT: Oops posted in wrong section - I should have posted in "Exteriors" - sorry about that...newbie
(see attached pics)
On the truck I just bought the front tires are 235/85 r16 and the duel rear is 245/75 r16
Ok, so google search for height calc:

7.9" vs 7.2" height


Q1: Is my x-fer case or diffs damaged from rotational speed difference? I'm sure the pervious owner drove it in 4WD based on tire wear.

Q2: The factory manual says the size should be 245/75r16 but has an option for 265/75 for the dual rear end. Does anyone run 265/75 and if so, what do you think of them? Any advantage/disadvantage aside from the slight width difference?

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Definitely need same zize tires from amd rear if its 4x4. And being a dually 1 tons if I were you, id run the 235/85s all round..
They're tall and skinny sorta profile but still big. Replace the rears, or Buy 6 new and keep the front as spares. I run 235/85 on a few of my trucks, and i run 265/75 on a bunc of my trucks. 265s are noticeably bigger than 245s. Theyre actually a simlar height to the 235/85s just wider. Id say they're too wide to comfortably run on a 90s dually. Good tires though. If you wanted a wider front tire to make up for the rears you could run the 235/85 in the back and the 265s up front.

 

[BuiltToWork]

Thank you!
I am interested in loading the truck down/hauling with as much weight as possible (safely) - it is not a DD.
Farm use, tree stump pulling etc.

I did a little research and the gap between the rear should not be less than 1/2" so when I get home I will check the 245/75 set up.
I really like the BFGoodrich A/T so I boiled it down to:
235/85
or the
245//75

Some calcs from the tire calc website:
Factory Stock:
225/75 : rev per mile: 688

235/85 : rev per mile: 635 (-8%)
245/75 : rev per mile: 661 (-4%)

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Load Range
so I am looking to get MORE torque but, both those tires will be less torque, but the 245 will be less of a loss (if they fit)
source: https://tirepressure.com/bfgoodrich-all-terrain-t-a-ko2-tire-pressure

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[BuiltToWork]

I could go with the 235/70 for a 1.2% increase, but then I will load load capacity, which is more important.

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[BuiltToWork]

Definitely need same zize tires from amd rear if its 4x4. And being a dually 1 tons if I were you, id run the 235/85s all round..
They're tall and skinny sorta profile but still big. Replace the rears, or Buy 6 new and keep the front as spares. I run 235/85 on a few of my trucks, and i run 265/75 on a bunc of my trucks. 265s are noticeably bigger than 245s. Theyre actually a simlar height to the 235/85s just wider. Id say they're too wide to comfortably run on a 90s dually. Good tires though. If you wanted a wider front tire to make up for the rears you could run the 235/85 in the back and the 265s up front.

I talked myself into 235/85 (dually space concerns) and reading your post just confirmed it. Thanks!
Now for a bunch of googling to find the cheapest

BFGoodrich All-Terrain T/A KO2​

in size 235/85/r16

I can always re-gear the diff if I need more torque. Not worried about the rear, but the front does not look like fun and/or easy.

 

[bluex]

Don't forget on your weight rating to reduce the rear tire listing by about 10% (iirc) for using it in a dual setup. So your examples would only be good for about 2,777 lbs each. Most E rated tires have both single an dual wheel weights in the specs though.

I didn't realize you had to derate them on the rear of a dually until I was looking for a 22" wheel/tire setup for a customer an needing to make sure they would support his plans with the truck....

 

[Grit dog]

Stick with truck tire sizes and ratings. Not 235-70s.
If your 4wd still works fine then it’s not damaged.
Frankly any of those 3 sizes are about right although the 265s might be a little chubby for the duals.

 

[Grit dog]

4 load range E tires of any flavor on the back will not be the limiting factor in payload on that truck. Nothing to analyze there.

 

[AyWoSch Motors]

A load range E or 10pr 10 ply would be best IMO for a dually. You could even look for 12pr tires. My buddy runs 12pr 265/75s on his 84 C20 at 90psi. Thing rides like a rock.
Don't even know where he found them, but they're some heavy duty tires.

 

[AyWoSch Motors]

For visual reference:

My 94 C3500 dually has 7.50x16 10pr power kings.

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My 97 C3500 single rear wheel has Big Foot range D 265/75R16s.

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And My 98 K2500 burb has Carlisle range E 235/85R16s

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[BuiltToWork]

Thanks for the visual pictures, I will look up power kings, good look like the BF all terrains

 

[AuroraGirl]

A load range E or 10pr 10 ply would be best IMO for a dually. You could even look for 12pr tires. My buddy runs 12pr 265/75s on his 84 C20 at 90psi. Thing rides like a rock.
Don't even know where he found them, but they're some heavy duty tires.

for tread contact and for sidewalls resisting squish that would make most sense to me as well