It is one of the options for the bar end junction box
Down tube surely... and yeah, I didn't want that.
I think it can go wherever you want.
They do make a bracket so the bar end shifter can be frame mounted. Though I prefer bar end placement.
@Velocio started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
It is one of the options for the bar end junction box