Tread wear outer dually tires on F350

[Bruce and Jenna]

Ummm, wait. I meant the tires were overinflated. The middle two treads wore faster than the outer treads. Ain't that overinflation?

Which is why I figured to reduce unloaded pressure from 45 to 40. Note that my inner tires look just fine, i.e. even tread.

[wingnut60]

Bruce,
As I said, a strange problem. But I don't think lowering the pressure is going to solve it.
And, yes, wear in the middle inidicates overinflation.
I just can't feature what might be the cause.

[Bruce and Jenna]

I also posted this question on the Diesel Forum Stop, this one Tread Wear.

In particular, this post.

Then, when I looked for info on rotation, I found guys with the same problem Dually Tire Rotation - Ford Powerstroke Diesel Forum.

My conclusion -
replace my outer duallies with the current front ones,
buy new ones for the front.
Try full pressure, 75/60 for all tires under all conditions.

Unless someone tells me something else .

[R Gordon]

I have the factory BFG All Terrain 17's on my F350 Dually and run 65 psi loaded and 50 psi unloaded, and all rear tires are wearing normally. I have experienced the front tires wearing more on the outside edge than inside of tire. Ford Service advisor says that the I beam suspension up front allows tire to run at a angle when in turns, therefore causing wear. Alignment checked out OK. He said that was just something we had to live with driving a Ford with this type of suspension. He also said for $149 they would break all the tires down and rotate. I decided it would be cheaper to run until failure. I do rotate the front tires.

[Ray,IN]

Ron I have found that running the fronts at 80psi helps reduce edge wear a lot. Ya, kinda rough riding on rough roads when empty, but I think it's worth it.