BROKEN WRENCH TIP OF THE DAY #6 – “Clean” Cervelo P2 Di2 Build

I know this isn’t a “common” wrench job, but I thought I would post my new Cervelo P2 setup for anyone who is trying to do something similar (and to show off some of my “skills”…not to mention something I could do with a broken shoulder). I got a lot of good info from Here’s the build, routing, and photos. Feel free to ask questions.

Zipp Vuka Stealth Aerobar Setup:

  • Shimano Ultegra R671 Di2 bar end shifters
  • Shimano 9071 Di2 brake levers/shifters
  • 2x Shimano SM-JC41 internal junction boxes (stuffed inside base bar)
  • 2x E-Tube wires to connect the to bar end shifters to internal junction boxes
  • 1x E-Tube wire to connect the to internal junction boxes together

Bike Setup:

  • Shimano Ultegra 6870 front derailleur
  • Shimano Ultegra 6870 rear derailleur
  • 1x Shimano SM-JC41 internal junction box (stuffed inside seat tube by bottom bracket)
  • 1x E-Tube wire to connect junction box from base bar to seat tube port

Seat Tube/Post Setup :

  • Shimano EWW01 D-Fly
  • Shimano SM-BTR2 internal battery
  • Shimano SM-SW90B 5-port external junction box
  • 1x Shimano SM-JC41 internal junction box
  • 1x E-Tube wire from internal junction box to one near bottom bracket
  • 1x E-Tube wire to connect battery to internal junction box
  • 1x E-Tube wire to connect D-Fly to internal junction box
  • 1x E-Tube wire to connect D-Fly to external junction box

Both the front brake cable and Di2 wire are routed through the bottom hole in the base bar.

I was able to route the rear brake housing through the inside of the top tube. I just had to drill out the plastic cable ports by the steerer and seat post. Pushing the cable through took a bit of effort and trial-and-error, but the rear brake feels good.

I had to drill one hole in the seat post for the E-Tube wire. I’ve mounted the external junction box with zip ties to the seat rails. I really don’t need rear hydration this time of year, but zip ties are easy to remove and I can reposition the junction box when needed.

When, I get the time I’ll draw up a schematic…

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