It could be a manufacturing variance, an out of round tire casing, lack of routine tire balance/rotation, or as suggested maybe a broken tread belt. The odd wear and the thud noise are probably related.
According to the National Shooting Sports Foundation, AR-15 sporting rifles account for nearly 20% of all U.S. firearms sales.
Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ......
Originally Posted by Ronald W. Reagan: Government is not the solution to our problem; Government is the problem.