I'm not talking tread depth. I'm talking about how chopped up the tread is. "Heel and Toe" wear, as it's called. Basically, the tires are no longer round anymore. They are jagged. In one direction they still roll smooth. That would be the direction they USED to roll in. But now you've rotated them and they all roll the opposite direction (or at least some of them). You probably have some "conicity" going on too (tires having a cone shape to them). These different types of wear could be pretty bad depending on how long it was since the last rotation, and how bad the alignment had been recently.
What I'm saying is when you run tires one way for too long, they are going to be straight weird when you turn them the other way (that is: after rotation). This is especially true if your alignment was whack, or if the tires are low quality or prone to certain wear characteristics. Usually they will wear back in after a short while. They will quiet down and track straighter, etc. But if they are really messed up, then the damage may be too far to reverse. Best plan at that point is to turn them back around and run them as far as you can.
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