Shiv TT Di2 Upgrade

The Shiv TT was never designed for Di2 electronic shifting so I needed to get creative.  The frame had a good internal cable routing system with internal noodles so the basic routing was there.  The approach I took was as follows:

• Internal seatpost battery, secured using Sikaflex polyurethane adhesive
• B Junction inside the frame near the fork stem, accessible via headset bearing holes
• Battery inside frame from battery to B junction
• 5 Port A junction on top of stem
• Di2 front and rear dérailleurs mounted using existing brackets
• Di2 dérailleur cables routed inside existing frame noodles trimmed at the top
• Ultegra 2 button shifters on end of TT bars
• TT bar cable routes enlarged to pass the Di2 plugs
• Shimano climbing shifter (To control satellite shifters at the bullhorns)

To allow me to run the cables fully internally from the B junction tucked in the frame behind the headset bearings down to the front and rear derailleur exit ports I had to cut the frame noodles away from there entrance holes in the top tube of the frame.  These are the two front noodles.  The rear noodle can remain intact for the rear brake cables.

The top end of the deraillieur noodles was now just open to the inside of the frame, one of them was able to be blocked and the other was used to bring a short cable from the B junction inside the frame out to the A junction on top of the stem.

I was able to pull the cables out through the headset bearing holes temporarily to make the connection then wrap it in foam so it couldn't rattle and poke it all into the frame.

The battery cable wire was a lot trickier.  I had to drop it down the seat tube then fish it all the way up to the head end of the frame with trace cables and hooks.  It was very difficult to get past the bottom bracket which had a solid alloy cylinder in the frame.

Finally a small wire connected the B junction inside the frame out to the A junction on top of the stem.

The A junction took the cables from the TT bar end shifters and the climbing shifter hidden in the nosecone and retrofitted to some switches on the base bar grips.  This gave me the option to shift from the TT position or normal base bar riding position.  This made long training rides a lot more practical and comfortable.

Shimano battery bonded into seat tube

Battery cable from seat tube to head stem

B Junction inside frame at head stem - Connects battery, FD, RD

Cable from B junction to A junction exits through a spare cable noodle which has been cut internally

Cable noodles inside frame needed to be modified for Di2