So I rotated my tires today and the back wheels both had the inside edge of the wheels worn down 1/32 or less but almost exactly the same. Kinda looked like one does when you rub the curb but on the inside exactly the same on both almost machined but ruffer. I looked in the wheel wells thinking something was rubbing......nothing anywhere. The wheels look perfect other than the inner lip. 2005 roadster 13K miles. The car rides perfectly at any speed, hands off the wheel. Any ideas?

Dave