Well, it's my take on a Max top tube really. […] I make my own from a round OD31.8mm top tube normally, or in this case a Zona OD28.6mm.
Wait, you shape your own tube starting from a round one? Can you tell/show more about this?
I found some old photos. Same principle
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@Hulsroy started
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Wait, you shape your own tube starting from a round one? Can you tell/show more about this?