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Very in-depth thread of mini v-brakes with aero levers.
https://fixed.org.au/t/brakes-can-stop-do-wanna-fitting-tektro-926al-mini-vs/59913
Also this:
https://www.gravelbike.com/v-brake-arm-lengths/
https://www.gravelbike.com/weekend-project-v-brake-conversion/
I tried running v-brakes on my older touring frame and the posts were too close together to work successfully, so I went back to canti’s, and that was with TRP RRL aero levers. It is achievable though.
Good luck with the build. Would love an old tandem.
EDIT: Fern also make a a lot of rim brake drop bar bikes with mini v’s and aero levers.
https://www.fern-fahrraeder.de/
EDIT 2: TBH, as much as it is a pain recabling bikes, particularly a tandem, decent Tektro mini v-brakes and canti’s aren’t much and use the same pads, so you could experiment and see what works the best.
Brake post distances:
Front: 78mm c-c
Rear: 87mm c-c
I haven't found a definite yay/nay online but it looks like v brakes would fit.
According to Sheldon Brown, V brakes are not compatible with aero style brake levers (such as those on the Dawes tourer). Has anyone experience to the contrary?