I have about 18 hundred miles on a new OEM Bridgestone rear tire and the center section had already a very distinguished flattened area in the center of the tire. The same thing happened to the first tire so I am wondering if we are running the correct pressure. I have had it at 41 pounds from the start so I am thinking of adding a few pound to see if it will eventually round out. Has anyone else experience this on their rear OEM tire?