What is the effect of excessive negative camber on tires?

Excessive negative camber increases the angle of the tire's contact surface, causing the inner edge of the tire to make more contact with the road than the outer edge. This leads to uneven tire wear, specifically wearing down the inner edges significantly faster than the outer edges. Over time, this uneven wear can result in compromised handling and reduced tire life.

The other options suggest improvements in performance or balanced wear, which do not align with the negative effects of excessive negative camber. While some negative camber can enhance cornering grip, excessive amounts can create more problems than benefits, particularly in terms of tire wear. Thus, the primary consequence of excessive negative camber is indeed the uneven wear of tires, particularly at the inner edges.