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Di2 jct B

I am looking at putting my first tt bike together and am planning on using di2.

I am struggling with with the wiring layout, not helped by being in the planning stages and not having the bits to hand.

I really want to use a bar end jct a but think I will need more ports. can I use a second jct b 4 port to join up the sattelite shifters??

does anyone have a wiring diagram to show?? its a cervelo p3 frame so limited opportunity to hide things in the stem


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