I have 2 bikes with fittings for both, My Koga WTR, came with Magura Hydraulic rim brakes,
I see no reason to replace them 4 years later, .... they mount on V/cantilever posts.
Likewise the Mtn BB7 mechanical Disc brakes on my Bike Friday pocket Llama, they're fine too..
a good thing is the lack of rim wear, using disc brakes.. in wet weather ..
but good Kool Stop Rim Pads are, as advertized, rim friendly.
[Trek 520, is likewise offered in either rim/V brake & a 520 D for Disc]
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Last edited by fietsbob; 06-01-17 at 10:44 AM.