I have a set of 20 H/C RR's and some 4 H/C RR's. I will run them back to back at ECR and provide my input to see the difference between basically "new" and "dead"... The 20 H/C RR's still look good from sighting the wear "hole" on the tire. They could easily go another 20 H/C's as far as rubber depth goes.
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