• 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.

  • Use a bit of string on frame to measure cable length needed, then add a bit for saftey.

    You'll need a main junciton box A, and a B. B goes in bottom bracket.

    Or just by a groupset without brakes/crankset. Can be done.

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