Any idea what their thinking is with that slightly unusual change in dimensions a third down the down tube?
Aeroz round the bottle?
Oooh that's a good thought, that could actually be it. Not that I'm 100% convinced it makes that much of a difference, but as reasoning, that's sound :)
@PhilDAS started
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Any idea what their thinking is with that slightly unusual change in dimensions a third down the down tube?