• That's interesting. Thanks. Mind you, it's as ugly as it is interesting. Why does that twist increase the stopping power? Something to do with the pulley effect?

    Pretty much exactly the right U-brake though. Just need to find one now. My concern is that the straddle cable will be interrupted by the seatpost. Ideally I want at least 5mm of clearance on either side. As I have artfully illustrated here.

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