• Is there a good idiots guide to building a hydraulic ultegra di2 bike?

    I am probably going to buy a groupset in parts as i don't need brakes or crankset/bb but i've been finding it a bit difficult to work out which junction box you need and which length cables etc.

  • How do you know which junction box you need? there seems to be 2 types (3 or 5 pin)

    I'll be running an internal battery.

    I've found a few complete groupsets but they still come with STIs, which i won't need as i have 785 / 805 hydraulic setup.

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