I've recently saw that a bmx frame was hydroformed.Is it better than not hydroformed?
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According to wikipedia, hydroforming is a cost-effective way of shaping ductile metals such as aluminum, brass, low alloy steels, stainless steel into lightweight, structurally stiff and strong pieces.
In reality, most aluminium frames are made this way. They start with a simple round tube and form it in more suitable shapes. You wil have to look hard to find non-hydroformed frames.
Not inherently, but hydroformed tubing has more possible shapes and distributions of material, and potentially allows the bicycle designer to design a lighter bike of the same strength, or a stronger bike of the same weight.
Or maybe the bike just looks cooler.
I think this link to Niner explains it best
The answer is that is depends