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Originally Posted by John V
So slightly less stiff than the GT3 bar on full soft. Interesting.
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I don't know the thickness of the GT3 bar, but about 75% of the stress on a torsion bar is taken by the outer 25% of the radius, so the OD has a much larger influence on stiffness than if it's solid or hollow. So it makes sense that the GT3 bar, being so large in diameter, would still have a higher stiffness.