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Originally Posted by Flipipino
The stock bar isn't a solid piece, it's hollow so of course it's going to flex more than a solid one would.
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Trust me, as an engineer I can assure you the bar would not be noticeably stiffer if it were solid. Most of the stiffness comes from the outer layers; the contribution of any portion of the section to bending stiffness is a function of the square of that portion's distance from the neutral axis. So the part in the middle contributes very little which is why they made the bar hollow.