How to route shifter cables along frame to a Rohloff external gear mech? I am currently converting my Rohloff's gear mech from the internal to external version, and I’d like to route the shifter cables along the downtube and chainstay. However, I’m not sure how to route the cables from the shifter on the right side of the handlebars to the gear mech on the left side of the rear wheel. What attachments might I need for this beyond any brazes on my Surly LHT (non-disc) frame? Does anyone have a few high-definition photos they could share of their working and time-tested setup?
As you have a steel frame, you will get the best result if you have a competent framebuilder add the appropriate brazeons. There are two sorts of brazeons that one could use:


Cable tie guides, where the cable housing is fixed in a groove with a small cable tie (looks much better than a big cable tie around the entire tube!)
various shapes of short tubes or rings, where the cable housing is fed through


Have a look at Ceeway for what is available (or talk to your framebuilder).

For a visually pleasing end result, the frame will need a new paint job after adding brazeons.