Thread: Structure vs mass

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You should look at the moment of inertia for each type of tubing. That's what tells you the tube's resistance to bending. Round tubing would typically only be used in a truss design.

For example, a car like the factory five '33 has a truss frame made of mostly square tubes.

https://www.factoryfive.com/33-hot-r...u-get-stage-1/

A 2x3 tube has about half the resistance to bending as a 2x4 tube.

If you look at beam deflection formulas, the deflection for a given load is inversely proportional to the moment of inertia (I). An I value that's half the amount means twice the deflection.