• I used the JC41 in my setup, and it's in the downtube, just above the bottom bracket. It has cables going to the battery and rear derailleur, with a spare slot for a front derailleur, and then a long cable which goes from it to the left shifter. The other cable on that shifter goes to the right shifter, which also has a connection to the bar end junction box.

  • Thanks. I assume my bike has a JC41 down there linking the components.

    There’s a tag on the cable protruding from the head tube telling me it’s 1200mm. I’ll give it a tug and see if I can make it reach the shifter.

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