Originally Posted by
mstateglfr
17.5mm internal and 23mm external for the Archetype.
since I have your ear, thanks for making a really uncommon but SUPER useful product- the offset rim brake holders.
I built a steel frame last winter, my first one, and mismeasured the rear brake bridge, but didn't realize until after paint while building the bike up. Your offset holders make everything work perfectly.
I love it when a plan comes together.