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@jersey
i do think a single tube an illogical approach that only makes any sense if the bar is completely straight from dropout to headtube.
i imagine the if the single bar makes a completely straight line between the head tube and the dropout then you're only dealing with torsional forces along the length of the tube when under hard pedaling.
i'm not sure which forces a pipe more easily resists... torsion along it's axis, or bending.
my suspicion is that torsion wins, and so bending that tube for aesthetics takes away from any logic behind the design because you're polluting the purely torsional system with forces along a plane. (???)
hope that makes sense. i'm not editing it for clarity.