Makes me wonder if this was a similar occurrence on a prior set of specialized branded knobbies... Forget the model but they were lower end wire bead budget replacements from the early/mid aughts. I may or may not still have them around in storage to inspect further (can’t recall if they were donated in the last purge or not.). After only moderate use they each began to fray around the circumference just above the bead/hook and bottom of sidewall and it did appear to be some kind of reinforcement with no sign of sidewall damage otherwise. No brake pad wear on the tire or anything... I checked and double checked pad alignment too many times to count.
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