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RX6 = CX9
RX5 = CX8.4The difference is 90mm and 84mm arm length. TRP stuff is just nicer.
TRP claims 90mm is for shimano and 84mm is for sram and campag.
I am using cheap tektro short pull levers with RX6 and they are fine.As @andy_k mentioned its worth reading Sheldon's article about mechanical advantage here: http://www.sheldonbrown.com/cantilever-geometry.html (mainly the V brake bit). What it means is you have to put the pads closer to rims compared to cantis but the lever pull is more.
@amey - how are the RX6's working out for you? I have to admit I only read up on the CX 8.4 and everything seemed positive about them so just went for them.
Love the look of the Paul Minimoto but didn't know if they'd actually work well in the wet and of course $$$$.
@youramericanlover Thanks for those routes fella! Your London to Newhaven was a similar one to what I had in mind. Not sure about about Ditchlinng Road with a saddle pack and 2 D locks! Oof.