I am in the process of replacing these Michelin Primacy A/S tires with a set of Conti Crosscontact LX25's. I rotated these tires every 5K, and they all seemed to be wearing evenly until this last check, today. Tire is on the Right rear at the moment, but was last rotated to the right front. (Its on the rear now because when I went to the tire shop, they removed my wheels then realized the tires ordered were wrong size, so they just randomly installed them until the right tires come in). Anyhow, what would cause this type of wear? The "better looking tire is 3/32, the "balder tire is 2/32. # are like the better, only the one is like the "balder" one.