Hey I had the same thing happen to my wheels.
2 sets of good rubber tires now.
The first time it happened I thought it was just bad rubber.
The second set was 3 1/2 DuBro and they did it also.
I had a ground loop and now think this is what did it.
The tires are dead center but must be rolling over.
I think I need to cut out some of the wheel pants.