• I'm going to try and put the bar end junction box in my Felt today. Ignoring the Shimano advice and instead will be using the magic of online vides that say no Y wire and one long wire from BB to left lever will work, then join the two together.

    Anyone know what size hole I need to drill in my handlebars to get the things through?

  • Just measured the end of one of my di2 cables/connectors as 5.03mm so I would say 6mm to be able to reasonably easily thread it through.

    99% sure you will need to update your firmware to use the new junction box.

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