• I'm building up a Di2 bike and want aero bars with shifting buttons.

    It looks like the barend junction boxes only have 3 ports - is there a way I can still have neat internal wiring with 5 ports or do I need to use the 5 port external junction box?

  • yeah - you can use jc41 "dumb" internal junction box(s) to connect things up. You will still need 1 regular junction box - but it can be 3,5 or the bar end junction box/charger port.

  • Cool thanks. The Shimano docs say the jc41 can be put inside frames - think it will fit in a handlebar?

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