I just discovered something. Since my rear wheels have independent suspension, they need to be aligned. How do I know this? I looked under my rear end and saw that both of my rear tires are bald on the inside. The middle and outside are very good. Rats. I need to by a set of rear tires and an alignment. If I had known about aligning the rear, I would have saved some money. Looking on the bright side, I get to light up the car for the first time. I was waiting until I needed tire replacement. Now I have to figure out what tires to buy. Does anyone here have any ideas? I have a 550, drive a whole lot, dont do twisties, and go very fast often. Never drive but a 12 cylinder!!!