Question

What happens if roll center and center of gravity coincides

Answer 1

The closer the roll axis is to the center of gravity, the less the chassis will roll in a corner. Chassis rolling at one end of the car or the other gives more grip to that end of the car.

Answer 2

Theoretically it will lead to infinite rolling stiffness. So sprung mass will not roll about roll axis but will tend to roll about outer tyre during turning.

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