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Its internally drilled for the di2 junction on both sides of the bars so you can feed the cable into the hole on the right and all the way through to the left and the junction box. The brake cables are external but you can run that Di2 cable internally. Thats the only Di2 cable that would be internal. The ones from left bar end to shifter and left shifter to the frame would be under the tape.
How can I "Run a cable from right shifter into right bar end hole all the way through the bars and into the bar end junction on the left side" if there's no internal routing?