Actually scrap all of this the brake boss would need to be removed as it would be in the way of the brake arm. Something with a deep cutaway and long arms like a Paul canti might work with a bit of fettling
Not sure on the above ... retracted.
It's for frames with thread in posts.
Unscrew the posts, boltnon the adapter, screw posts into adapter.
I don't see any reason the wouldn't work to drop the posts down just as they fobto raise them up.
@M_V started
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Actually scrap all of this the brake boss would need to be removed as it would be in the way of the brake arm. Something with a deep cutaway and long arms like a Paul canti might work with a bit of fettlingNot sure on the above ... retracted.