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Cheers. The hole is for internal routing of the rear brake cable. It goes into the down tube as you see it that picture, and emerges just above the bottom bracket, then running along the top of the chain stay. My hope is that it captures some of the nice "clean internal routing" vibes while swerving the frustrations of routing through the bottom bracket shell, chainstay, bars, stem, or head tube...
Great stuff. Nice to see this sort of bike with a nice fork crown / shoulders rather than the standard iron girder.
What is this lozenge shaped hole for?