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Thanks. Yeah bit of a bugger that one - i looked at doing a mod to the tektros but wasn’t confident of making it work given current tools / parts on hand - it’s definitely do able though - in order to use the existing cable clips you could also flip the Caliper and run it backwards so the caliper arms are on the rhs.
Running the cable up the seat tube looked too ugly to my eyes and Didn’t seem to result in much less bending / friction.
The way I did it required one reasonably unobtriusive cable tie and looks okay ish . As for friction yes there is more than on the front but the brake seems perfectly functional.
The only other option was to put the caliper on the lower seat post bridge plate situation - resulting in a pretty straight run which is the way they do it on those Freddie grubb neo retro mixte jobs - I tried it but with the larger long arm tekros they stick out way too far and looked like they would just get bashed up / bent
Nice.
I wanted to do exactly the same but couldn't figure out a nice way to route the cable. I see you've just done a U-turn. How is it - not too much friction? I would have thought going up with the seat tube would result in smoother angles, did you consider that?
If your calipers are appropriate you may be able to swap the clamp/cable stop bolt things and route it like this:
QR will still work.