What is going on with my steer tires?

My company recently bought new KW day cabs and sleepers. A few of them had a similar wear pattern after less than 10K miles. I saw reps from the tire company going through the yard looking at tires a while back. I guess I'll ask around to see what the verdict was.

 

It's there should be in a oblong circle deal.

 

There's always a Date Code and Country of Origin molded into every tire's sidewall.

 

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I run G399's all the way around. When I need a pair of drive or trailer tires, I pull the steers off, move them back and get new steers. They never go long enough up front to get any funny wear. Steer tires also run right down to the last 32 in the drive position without shaking, unlike a lug tire. I just like them because they run without shaking.

 

Yeah I'm gonna say age. looks like dry rot!! Not safe!!

 

Check the inward facing side. It'll only be on one side and sometimes the date will be facing in.

 

Its not only wearing the steers, there is excess wear on the drives, and trailer, its just they don't make an obvious visually defining pattern as well as a steer will show. What I did notice (idk the name for it?) is fish scaling or ramping is the best I can name it... The drive tires knobs or lugs would angle up, so if you were to rub your hand in one direction over the tread it would be smooth, but opposite direction would catch on the next knob. <-Sorry for the vocabulary challenged description.
But it did seem to help for the last two years I owned the truck.

 

@freightwipper this is what you are looking for. As you can see mine were made the 44th week of 2015. Check the inward facing side if you don't see it. This is my driver side, my pass side is inside.

 

It's next to the DOT number. Sometimes it's facing in.