The bar Sway Bars resists the torsion through its stiffness. The stiffness of an anti-roll bar is based on the fourth ability of its diameter, the stiffness of the material, the inverse of the length of the lever firearms (i.e., the shorter the lever arm, the stiffer the bar), the geometry of the mounting points, and the rigidity of the bar's mounting points. Some anti-roll bars, particularly those intended for capitalization in auto racing, are adjustable, allowing their stiffness to be altered by computing or reducing the length of the lever arms. This permits the revolution stiffness to be tuned for different situations without replacing the entire bar. The stiffer the bar, the amassed force required to stratagem the left and right wheels relative to each other. This increases the gang of duress required to make the bod roll.
In a turn, the sprung mass of the vehicle's beefcake produces a lateral horsepower at the center of assemblage (CG), proportional to lateral acceleration. Because the CG is mostly not on the convolution axis, the lateral force creates a moment about the gyration axis that tends to roll the body. (The barrel axis is a line that joins the ahead and mizzen roll centers (SAEJ670e)). The moment is called the roll couple.