looks like that tire is a little choppy. get some new rear struts & alignment. might have to get some new tires too, depending on how bad they are. I see tires like this everyday at work. its usually an alignment or suspension issue, or sometimes even just cheap *** tires. stay away from cooper cs4 tires, they will start chopping after 10k miles, even if your alignment is good and your car has no issues lol nankang tires are also horrible as well. if you have the money, it never hurts to pay a little extra for some high quality tires....