There's three main alignment angles that have to be checked. In particular, "camber" is the inward or outward tilt of the wheel as viewed from in front or back of the car. Positive camber is when the top of the wheel is leaning out. That will cause that tire to want to roll in that direction.
It's normal for some car models to call for a little positive camber but it's important that both wheels be nearly the same so the pulls counteract each other. It's also important that that camber not be too high because that will lead to the tire running on the inner or outer edge. That's the wear you're referring to.
It's time for an inspection of the steering and suspension systems at a tire and alignment shop, and an alignment.
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Tuesday, June 12th, 2012 AT 8:02 AM