We have a couple of these wired up with Di2 on our tri bikes. With a bit of patience you can almost completely hide all the wiring. Both of these builds use the EW-RS910 in the end of one aero extension. The extension shifter wires come out back of extension routed in small notch back on themselves and down the back of the extension riser where they can be taped or covered with heat shrink tubing. These then route to the cable/wire holes in the Kamm tail and inside the basebar. There is enough room to tie all the shifter extensions together using two JC-41 Junction B's and a short wire link or the 6-port Junction B from the SM-BTC1 internal battery external mount kit. The 6-port junction cylinder shape just fits through the round whole in the back of the basebar's stem.

I'll try linking a photo:

ETA: the photo link works but it won't show embedded here in the post:(

Don't know if this will help. I bought a TriRig last year after the steerer bolt on my Vuka Stealth broke...and Zipp no longer had the part in stock (aka, discontinued). Good luck!

https://forum.slowtwitch.com/...string=vuka#p6221562

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"Most of my heroes don't appear on no stamps"
Blog = http://extrememomentum.com|Photos = http://wheelgoodphotos.com

Some pics of my 2006 P3C conversion (needs a good clean) - I love the Torx bolts of the bar

Nice job, but would be even better without the di2 junction box where it is, quite an easy job to put it under the saddle completely out of sight and out of the wind.

Thanks - interesting idea to put the junction under the saddle, wouldn't I need some sort of junction box near the bars due to the short length of the shifter cables?

Either way, every season I think it's time to retire the bike, but with the ascent of the disc brakes, I'm not sure I want to dump all the rim brake wheels just yet.