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there's a definite knack to setting up cantis-best way I found was to put something about as thick as a beermat between blocks and rim then you can push against that to set up the arm angles, then do the same to set up the cables.
Once you've done that everything should be perfectly aligned and its just a case of finding the sweet spot on the straddle length/height for maximum braking power.
Looking nice anyway...
My observations from a trial at cabling it up:
1) Canti hangers on a small frame are a pain to cable up
2) Cabling up canti brakes need about 3 pairs of hands
3) The front cantis are shuddering a bit, I'm assuming thats normal and I will need to toe in the pads?
4) Right shifter is buggered, which means I'll have to take it off and use a spare
5) Luckily, as I haven't installed the quick disconnect splitters yet, not quite as painful
I have another 7900 shifter that is mechanically fine, but visually poor. Anyone know how easy it might be to change the brake arm?