With too much negative camber, the wear is on the inside. Again, the pattern is a distinctive one and tells you at once that an alignment is needed. Loose or worn suspension parts can cause tire and alignment problems. Worn control arm bushings, for example, allow the tire to wobble and slip, and this causes small scuff marks in the tread. Very loose connections caused by worn bushings or, more commonly, badly worn ball joints, can result in areas of such heavy wear that they actually become depressions.
Cupping is a condition caused by the tire bouncing as it rolls.
Small areas of heavy wear are created. Worn shocks are often the cause of cupping, but loose suspension parts or tire imbalance are also possible causes.