The Roll Center

As a car rolls, it must rotate about an axis. The roll center of a suspension system the point where the roll axis intersects a plane that passes through the front or rear wheels. There is a roll center for the front, and at the rear. 

Implications

A roll center that is farther away from the car's center of gravity will cause the car roll more, but a roll center far away from the ground will introduce something called a "jacking" force, which will try to push the car up as it turns.