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I know you can use a junction port (ie: SM-JC41 Internal Junction Box B) for this, but are there any Male to Female extension cables?

Root Cause: R600 to 5 port junction for a TT setup near the base lever (Magura's so can't use the standard integrated TT brake/shifter)

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No, there are not any male-to-female "extension" wires available for the Shimano Di2 E-Tube system. You can use a junction as you said, or you can use the two-port ANT module. You could also modify an E-Tube wire to lengthen it yourself, if you are handy with a soldering iron.

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Extension (Male/Female) wires are now available since a few weeks. You can ask your reseller, they are not on general availability yet. I got one of them because I moved my aerobars forward and needed some more length

Cheers,

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  • Welcome to Bicycles! Thanks for answering one of our questions. We recommend that new members take the tour to make best use of the site, and since you're answering, How to Answer will be helpful also. Again, welcome
    – andy256
    Dec 22 '16 at 12:29
  • Can you provide a link to an example of an extension cable that's now available? Thanks.
    – SSilk
    Dec 22 '16 at 18:59

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