My setup

Why doesn't my pics show up?

Another try

But you have mechanical shifting...

OP, search for davews09 posts recently on his junction A being at the saddle. Im a thread about Diamondback customer service.

The SC is pretty much set up for clean cable routing internally. I wish they would have put the Madone cable management in it. Only the junction A shows.

They have a new seat and storage/bottle system I ordered. Looks like a better solution. Might check on that

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http://www.TriScottsdale.org

Mount the junction A on top of the stem cover or behind the saddle. Behind the saddle will require 2 junction B's stored in the front end and then drilling a hole in the seatpost to route the wires outside and connect to junction A. zip tie junction A to seat rails.

Behind the saddle bottle vastly depends on your seat and fore/aft position. Easiest is usually just using zip ties to tie the cage to the seat. Or look at the mounting options from xlab.

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blog

+1 on the saddle mount depending on fore/aft and saddle type. I prefer zip ties with a strong cage. Get good, tough zip ties and check them before every ride. A good idea to put new ones one before a race.

Here is an alternate junction mounting to consider: Put it inside the top tube storage.

I punched one small hole and fed the wires through one at a time and connected to the junction and dfly. The stem cover has markings on it specifically intended to mark "cut here" close to the base bar. One wire tie on the bundle under the cover then one placed over the cover. One more set directly in front of the top tube storage and the final one inside the storage box once everything is pushed though.

For me, this placement is the result of using several different stems and extensions over time and unmounting, remounting, unmounting, remounting many times.

All of this said, if you are confident in your setup and your extension doesn't interfere then just tape/Velcro the junction to the top of the stem cover. I had it there for months.

-Rekabdot

Practice grabbing the bottle behind the saddle in training. Can be tricky especially in racing stress situations. For that reason I do not use the behind the saddle solution, but not anyone is as clumsy as me ...

Sounds like starting with the junction a on the stem might be smart. Ride it a bit this fall to make sure all is good, then this winter try moving towards the bento box or seat post idea described here.

Behind the seat seems like zip ties is simplest. I have had behind the seat bottles before, so grabbing them while riding isn't that bad. I will figure the exact configuration once the bike arrives. Is there a favorite cage that seems to be the most robust for handling the stress of being zip tied and not launching a water bottle? I haven't had behind the seat bottles since I used simple metal cages and went with the heavier gauge mountain bike cages behind the saddle.

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Ryan