Tarmac Di2 wire routing.

[Vinci]

I am building up an S-Works Tarmac and have hit what seems like a snag...

How on earth do you get a the cable from junction A (at the bars) to junction B (in the BB)? The downtube internal cable routes are setup for mechanical cable housing, so the cable holes are far too small for a Di2 connector. They are also, oddly, not a removable stop like the rear brake.

Are these supposed to get drilled out? Do I have to cut and re-splice the Di2 cable?

[oldpotatoe]

I am building up an S-Works Tarmac and have hit what seems like a snag...

How on earth do you get a the cable from junction A (at the bars) to junction B (in the BB)? The downtube internal cable routes are setup for mechanical cable housing, so the cable holes are far too small for a Di2 connector. They are also, oddly, not a removable stop like the rear brake.

Are these supposed to get drilled out? Do I have to cut and re-splice the Di2 cable?

They need to be larger, obviously..Is the frame advertised as mechanical and EPS/Di2? If not, yup, make the holes bigger.

Don't cut and splice.

[Vinci]

It's definitely a Di2-compatible frame. Same thing they are running on a bunch of pro teams, from what I can tell. It also includes all the plugs and whatnot you'd expect for running Di2 on a frame that supports both.

I've poured over all the Specialized documents I can find, which is 1, and they cover all the wire routing except for the downtube. It just seems like there should be something I'm missing. Would going to Di2 really be a on-way conversion? If a shop (or me, in this case) drilled out that stop, you certainly wouldn't be able to run mechanical again.

[oldpotatoe]

It's definitely a Di2-compatible frame. Same thing they are running on a bunch of pro teams, from what I can tell. It also includes all the plugs and whatnot you'd expect for running Di2 on a frame that supports both.

I've poured over all the Specialized documents I can find, which is 1, and they cover all the wire routing except for the downtube. It just seems like there should be something I'm missing. Would going to Di2 really be a on-way conversion? If a shop (or me, in this case) drilled out that stop, you certainly wouldn't be able to run mechanical again.

If it's both, then there is a way to get the connector into the downtube holes..that metal cable stop doesn't come out? From viewing some pix on google.

[Raffy]

Shouldn't the DT cable stops have that tiny hex screw that allows you to remove them?

[tigoat]

I do not have a SW to investigate but if it was truly designed for both mechanical and Di2 then it would have a replaceable/removable insert at each cable entry point. A quick confirmation to see if it can accommodate Di2 would be to take a look around the FD mount area on the seat tube to see if there is a rubber plugged hole there, as if there is none then there is a good chance your frame is not Di2 ready from the factory. A quick trip to a Specialized LBS will clear it up quickly.

[Vinci]

Definitely a plug by the FD.

The downtube cable paths don't have one of those removable stops like other brands/models. The rear brake path does, though. I don't see an insert in the downtube stops either. It looks like carbon inside to me.

I don't have a photo of the inside of the stop with me, but here is a closer photo of what the stop looks like...

http://uploads.tapatalk-cdn.com/20160901/751e8bce1db05044e99e0debfa88f28f.jpg

[christian]

Doesn't the cable between Junction A and Junction B on a 2016 Tarmac enter in via the rear brake hole? If there's a narrow slot in the brake hole, then that's definitely the intent. See Diagram seven on this .pdf

http://service.specialized.com/collateral/ownersguide/new/assets/pdf/0000040986.pdf

Disclaimer: Ha! Electronic shifting? Get off my lawn!

[christian]

Also, pics half way down in this thread:

http://forums.roadbikereview.com/specialized/di-2-tarmac-352765.html

http://fcdn.roadbikereview.com/attachments/specialized/311982d1453941082-di-2-tarmac-img_2601.jpg
http://fcdn.roadbikereview.com/attachments/specialized/311980d1453941072-di-2-tarmac-img_2602.jpg
http://fcdn.roadbikereview.com/attachments/specialized/311983d1453941088-di-2-tarmac-img_2600.jpg
http://fcdn.roadbikereview.com/attachments/specialized/311981d1453941078-di-2-tarmac-img_2599.jpg

[Vinci]

Very interesting. Thank you for the photos and link. I was looking at that possibility last night but dismissed it because I didn't think the cable could get down the seat tube with the seatpost in place. Maybe there is space that I didn't see. It would certainly make a lot more sense than expecting the shop/owner to drill the frame.

[christian]

Look carefully at the drawing in diagram 7. The wire does a u-turn and goes forward in the top tube, down the headtube and down the downtube once it's through the brake hole to get to junction B. Makes perfect sense. #electronsdonthavetotakethestraightestpath

Campy 10 for lyf, bro! :)

[Vinci]

I think I see why all my personal bikes are mechanical (and externally cabled) now.

Thanks very much for clarifying. This makes a lot more sense now.

[Vinci]

Thanks again for the assistance. I was able to get things working last night. Progress!

http://uploads.tapatalk-cdn.com/20160902/965c399b7127f158ea22c7d6473f87c6.jpg

[shovelhd]

That bike looks KILLER.