[philinjax]

Hollow torsion bars have greater torsion force for a given degree rotation than solid bars of the same diameter and obviously are lighter than solid bars. One can get away with a smaller hollow bar than solid bar and have equal performance. the superior performance of the hollow bar has to do with its greater surface area per diameter than the solid bars. I don't remember the math/physics behind this, in fact, I don't remember a lot of things any more, but I am quite certain of the theory.



Phil