Joined: Mar 2012
Posts: 1,568
Likes: 720
From: Port Dover Ontario Canada
Bikes: 1965 Dilecta Le Blanc, 1956 Royal Nord, 1972 Raleigh Sports, 1972 CCM Turismo, 2014 Salsa Vaya, 2019 Giant Lafree and others
Both of the Mixtes shown are HiTen steel frames, that is they have fairly robust and thick steel tubes. I would think a brake clamp could be constructed and installed without harming the frame. A two piece clamp across the twin tubes behind the the seat tube would likely work. The plate style like on the black Raleigh could be supported on the twin top tubes and clamped to the seat tube like a FD perhaps?
I'm hoping others have ideas as I have a Raleigh Record Mixte that is being built as a 5 speed.
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We are what we reflect. We are the changes that we bring to this world. Ride often. -Geo.-