A anti-roll bar is an automobile suspension device. It connects opposite (left/right) wheels together through short lever arms linked by a torsion spring. A anti-roll bar increases the suspension's roll stiffness -- its resistance to roll in turns, independent of its spring rate in the vertical direction.
In a turn, the sprung mass of the vehicle's body rotates around its roll axis. The roll axis is a line that joins the front and rear roll centers. If the vertical distance between the roll axis and the center of gravity is not zero, a torque (roll moment) equal to the centrifugal force times the distance between the center of gravity and the roll axis will be exerted on the sprung mass, causing the body to lean towards the outside of the turn. This force is called the roll couple. One effect of body (frame) lean, for typical suspension geometry, is positive camber of the wheels on the outside of the turn and negative on the inside, which reduces their cornering grip (especially with cross ply tires).
Anti roll bars provide 2 main functions:
ULTRA RACING 19mm Rear Anti-roll Bar: Proton GTI [UR-AR19-008]
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