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His explanation makes the most sense: to what end such a difficult rear brake route?
TT? Aero considerations? Then what about the shifters and derailleur hanger: no cable has run under that BB and you'll have to work pretty hard to convince me that anyone would go to the effort of shaping band-on cable stops to fit Max tubes.
I think AngusMcGyver could be onto something.
But with the unknown frame history who knows :)
As i understand things, a frame builder gets in blank tubes, then cuts and adds vent holes themselves. It could be the tube was first off the rack of tubes prepped for another frame/size build, and just used for a custom build, it's simple and logical, bit boring :)
Straight through aero conversion for rear brake is more sexy, but no guides on top tube.......... zip-ties, tape, home diy aero conversion.
It just gives the frame some nice mystery, only the frame builder knows, and maybe the first and second owners.
Looking forward to a lairy paint job next year :)