What does this tire wear mean?

[dspaulding70]

How's the retirement?  You got out at the right time.  The pressure on the tire is maximum.  Car manufacturers always recommend lower than that maximum.  I see a lot in the 26psi to 28psi range.  That 275 BFG has a 2149 lb. rating at max psi.  Your Charger has a lot less weight than that on that tire.  Some charts show that size tire will work on a 7" rim, which was the biggest I could find for $6 at Pick a Part back in the day.  I had to drop the pressure down to 18psi, and was still wearing in the middle.  The black R/T has 15X8 with that tire, I'm running 22psi, and wearing in the center.  The front are 245/60-15, on a 15X7, at 35psi, and wear even.  I think it's more about weight, and load rating, than anything.  Wider rims do help, though.  The cordovan Charger, with 275/60-15 in back, on 15X10 rims, wears even with 35psi, but they look like balloons, but that could be because the front tires are so tiny.  The BFG is a hard tire.  Mine chunk up like yours, too.

What wheel is that on the green charger in the middle picture?

[375instroke]

On another thread, he says they are Magnum 500s with 4.25 backspace on the 15x7 front, and 4.5" on the 15x8 rear.