Everyone tells me that mine wear center only due to over inflation, but I feel it is because of wheel spin causing the wear (the tires with the matching outer tread were on the car the same amount of time, even rotated front to back at 3000 and 5500 miles, but then not swapped again, and rears are worn out, fronts still are good for awhile).
I know I am not able to wear rear tires like lots of you here, I also don't do burn outs, but I do leave like I stole it, and with the JMod get pretty good scratch 1-2 shift. I can see the layer of rubber as a glossy dual stripe in the side view mirror behind me.
I don't have any handy pictures of common wear problems like inner or outer shoulder, but my 97 Cougar wore then quickly until I found a place that would do a proper alignment front and rear on a lowered car. Lowering didn't make it impossible to align, just no one would do it with all the available adjustments after replacing all steering and suspension. I would take it in with most things in the red, and get it back that way.
Also older tires that look cracked or dry rotted are no good. They frequently let go when you can least afford it.
This was on a Cougar I had planned on buying to replace my wrecked one, listed as having near new tires, so I figured the rest of the ad was BS as well: