I have just been through all of this with my Arthur Caygill, which, for reasons now lost to me, I decided to build 'trad'.
Feetabix's long, detailed and superb post reminds me exactly why BITD, as soon as they were available, we all binned canti's and bought V-brakes.
All of that said, well set up canti's do work, not as well as a badly set up v brake, but they will stop you in a hurry if they must.
Other than aesthetics, I see no reason why people are so attached to cantis, it's like fitting drum brakes to your car... retrograde.. although, that word does start with retro, so I guess that says it all.
Vive la difference!
The analogy isn't quite there with the drum brake thing on a car. Cantis setup correctly can work just as good as Vs - they're just trickier to get there.
The difference is more the complexity, and having to be more mechanically aware of how they will work best, than purely whether they will actually work as effectively. IME properly setup cantilevers are just as powerful as correctly setup Vs - it's just more likely that the person doing the setup will find getting the Vs to work effectively a lot easier than doing the same with cantis.
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