Why is body roll bad?

[mpg9999]

The suspension system geometry of a street car is designed to keep the bottom of the tire parallel with the road for maximum contact patch. At rest, the car's suspension has a particular geometric relationship to the road surface. Body roll changes that relationship, and reduces the suspension's ability to keep the tire parallel to the road.

Body roll effects the camber, and the camber change thus effects the traction of the tires. The more contact patch you have the more traction you have, but when a vehicle begins to lean, it forces the tires to lean onto one side. The outside tires has increased positive camber and the inside tires has increased negative camber. So a tire with a flat contact patch before body roll now has to operate on only a part of the edge of the tire during body roll. This loss of traction lets the tires give way to weight transfer to the outside of the car, which makes the car slide sideways usually.

Werd.