[Carl n Susan]

The very outside (and inside) edges of the Sailuns and Goodyears will tend to look worn compared to the rest of the tread after a few years. This usually due to wear of turning left and right, particularly tight turns to enter/exit a campsite. There is extra rubber there to allow for the expected wear. This is usually no more than 1" in from the edge. If the wear is visible more than that or it affects one tire more than all the others, then alignment might be an issue. Two years on a Sailun should not be enough time to wear them out.