Excessive wear on inside shoulder of Sumitomo's?
 

as anyone else noticed this or have an explaination? I still don't regret buying these tired one bit. I've just seen 4-5 cars with the inside shoulder rubbed flat. Both on S4's and WRX's. It doesn't look like a camber issue as it's worn 1/2 between the sidewall and the tread. Any ideas?

just wondering, which Sumitomo's?

HTRZ II

only have heard great things from owners of these tires, alignment?

Gotta be alignment with that kind of wear
 

Negative camber or too much toe-out can cause inside tire wear. Add a low air pressure to the tires and you get an extreme tire wear very quickly.Camber outside or to the extreme limits of the specification will cause tire wear on the inside or outside of the tires. Unequal camber can cause your car to pull to one side as well..