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On my last two sets of Pilot Power rears, I have noticed that they developed a noticeable line about 2 inches to the left of center, all the way around the circumference of the tire. I have asked many people if they knew what it was, no one had a clue. I called Michelin today and after awhile of setting on hold and getting transferred, I finally found someone that had an answer. According to Michelin, this is a new feature built into the Pilot Power, “a static dissipating strip”. Feature is only built into a few models of tires they sell. Appears it is for helping to get rid of built up static as a safety precaution when pulling up to a gas pump. Who would have known?