I went to Discount Tire, where I bought them initially, and two of the four tires were measured "bad" by their little handheld scanner.

There is only 20,000 mi on the tires, so they can replace those two tires for $371.

They're going to move the two "almost but not officially bad yet" tires to the front since there is no possible way that they will last for another 35,000 miles, and at some point here in the future, they will qualify for warranty replacement as well.

Absolute worst case, if my drivability is impacted by having two new in the back and two old in the front, I can always purchase two new tires for the front.

Not a terrible price for two new tires!

By the way, their handheld scanner measured that the tires were not evenly worn between the inside, middle, and outside, but they did not cause me any fuss that I did not properly maintain them.

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