I think your's is the first negative comment I've ever read about the exedra max? I studied all the comments and forums related to tires for the rear of the rocket and the consensus seems to be either Exedra Max or Avon, with only a very few sticking to Metzlers. I went with the Exedra Max and feel like it's a great tire, wet and dry. Can't tell about wear so much yet but I've got 5,000 miles and they don't seem near 1/3 worn? What air pressure are you running? It's the only thing I can think of that would explain what seems to be your anomaly.