By the way I was told one (not sure if it’s true but it makes sense) that the reason you can’t use V brakes on a road bike is that, on a caliper brake the force is going through a strong part of the fork (the yoke) whereas all the force on V brakes go through the actual arms of the fork themselves, and if you’ve got carbons then they’ll shear since they’re not designed for sideways stress, only longitudinal.

Anyway just my random QI comments, and disclaimed as usual by the fact that a bloke in a pub told me so it could be all completely wrong, but it makes sense in that V brakes are much better than calipers and probably with little additional weight (if any)

Kaz

p.s. Say hi to the tribe from HK!