I replaced them around 10k miles when they were down to the wear markers. I wasn't very easy on them, and they wore like butter. These were the RSA's BTW.
I replaced mine at 17K. I didn't rotate them for 7K so the fronts showed much more wear than the rears. I was buying decent all seasons anyway, so I didn't care about uneven wear too much. If I religiously rotated them every 3K miles, they may have lasted for 20K.
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