Which base bar?
Just about any bar can handle a Di2 and brake housing.
Sounds like the boys in the build factory got lazy or misdirected.

Any pic to illustrate this?

call whomever you talked to with sales.

i recently went through a purchase / return with QR. Your sales point of contact SHOULD be able to help with any tech issues.

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80/20 Endurance Ambassador

I purchased a new PRFive this spring on-line, but mine is the model with mechanical Ultegra. When it arrived, the shift cables were routed on the outside bottom of the PD T4 aerobars. The cables were also long with plenty of extra length between the rear of the bars and the entry hole in the top tube. I've seen the same routing with Di2 wires in the showroom of a few LBS.

I just assumed they route them externally and extra long at the factory, because they know most people are going to tweak their setup with spacers, different length stems, aerobars forward and back, etc. External routing makes all those tweaks a little easier.

The day mine arrived, I swapped to longer stem, removed all the spacers from under the stem, cut the excess steerer tube off, and re-cabled the shifters through the aerobars. There was an entry hole in the T4 bars just like any other bars. I was glad to have the extra length of shift cables from the factory, because I added quite a bit of reach in my setup process.

I bought a QR5 this year and the DI2 was run outside the bars too. However, it didn’t bother me though because the first change I made was taking off the aluminum base bar and extensions and replaced them with carbon fiber. Sorry I can’t be much help but to confirm that is how they are shipping them out. There are internal routing holes in the base bar and extensions if you want to try and refeed them through.

Let me help you spend some more money: Pull the aerobar off, sell it on ST classifies for a few bucks and toss on a Tririg Alpha One. You will end up zero cables exposed along with a bike that is cleaner than a PR6.

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Team Zoot