Tire wear question

Pic’s might help.
You can look through this and see if you can find the problem.
https://www.tireimages.com/documents/tire-condition-manual.pdf

 

Post pictures

 

Typically, wear on both edges but not the center, would indicate underinflation. I never ran that much pressure in a steer, maybe 100 tops for 14 ply, I read 16 ply can go 120. I can say without reservation, over the years, I've ran just about every steer tire made, and no 2 wore alike. I never got 100K out of a steer tire, but always had jobs with a lot of turning, I'd try a different pressure gauge, no 2 of those were ever the same either. I think it's just the crap tires of today.

 

What brand tires? I would probably try a different alignment shop,

I run 130 psi in mine

 

How are the bushings on your rear suspension?

 

Steering box, drag link, and shaft will affect drivability, but won't cause wear like you're describing, and has no effect on alignment.

What area are you running, and what tires? What style of tire?

A pic would help.

 

On straight axles guarantee tires just wear like that. Manufacturers have tried to combat that with decoupler grooves on the tread edges. They help in many cases but not a guarantee. The first radial truck tires were the Michelin XZA without the decoupler groove. Them things would get nasty wear. Goodyear saw this in the early 80’s and came out with the G259 with the groove. It did much better. Michelin soon came out with the XZA2 with the groove and took the lead. Turning radius also plays a hugepart in that shoulder wear. Axle kingpin angles on Older trucks kept the tires more upright on the tread patch during turns. The newer angles for quicker tighter turns lay the tires down lower on the sidewalls and pinch and scrubb the edges of the tread badly. The tighter the turns the faster the wear on steers.