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PostPosted: Fri Mar 10, 2017 4:27 pm 
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I'm setting up a Tarmac and rather than having the Di2 junction box stuck to the bottom of my stem I would like to use the new Shimano Di2 EW-RS910 Bar End Junction Box for a cleaner install. However, this new junction box is only a two port box. So my question is, does anyone know how you wire up this system? If you use one port on the bar end box for a brake lever, and then is the other port intended to go to a junction box in the handlebar for the levers? That would mean there would be a third junction box in the frame. Seems like a lot of boxes, so I was wondering if I was missing something. Im also considering installing remote shifters for sprinting... that would mean yet another box. I want this to be a clean install so any guidance anyone could provide would be appreciated!


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PostPosted: Fri Mar 10, 2017 4:35 pm 
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conect one shifter to other and from one shifter leave one cable to the junction box


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Posted: Fri Mar 10, 2017 4:35 pm 


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PostPosted: Fri Mar 10, 2017 4:51 pm 
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Posts: 41
Its pretty flexible to set up as everything on the e-tube bus is kind of series parallel and none of it really cares how its setup so long as its plugged in somewhere.

As @grouk says, the simplest way is to go direct from the Bottom bracket junction (SM-JC41 4 port passive B junction) to one brifter and then another cable to the other and then a third cable to the RS-910.

If you don't have a long enough wire and or don't want to replace this, then you can use the new Y-cable or even a second B junction (SM-JC41) to connect it all and to extend any cables that are too short. You could also use the new inline D-fly (if you have use for it), as a coupler with a smaller e-tube wire as extension for your down tube wire.

Again, connect it how you like as it doesn't care, just so long as the parts connect somehow!


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PostPosted: Fri Mar 10, 2017 8:36 pm 
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Here you go;

https://www.youtube.com/watch?v=fg1X8G2pn_I

I've just done exactly that, so thought a video might help others.

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PostPosted: Sat Mar 11, 2017 8:19 am 
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On my all 9070 group set can I just plug an RS910 straight in? I don't need new battery, d-fly, etc, etc?


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PostPosted: Sat Mar 11, 2017 9:15 am 
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Yes you can do that. Just make sure to update everything.


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PostPosted: Sat Mar 11, 2017 1:44 pm 
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TurboKoo wrote:
Yes you can do that. Just make sure to update everything.


Great, thanks


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PostPosted: Sun Mar 19, 2017 4:32 pm 
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Thanks guys... That setup does make sense and looks really simple.

Any recommendations on the cable lenghts I need to buy?

I'm thinking I need to determine these cable lengths...

1.) From the bar end to the lever?
2.) From lever to lever?
3.) From the Downtube junction box all the way up into the handlebar and connected to a brake lever.

I want it to be tidy, but if I get wires too short it could be a real pain in the neck to get these connected.

(I'm running a 56cm frame and 44cm bars.)


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PostPosted: Sun Mar 19, 2017 4:39 pm 
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In the vid, I say what length wires I used for all those that you mention. I can't remember off hand what they were, but you might want to use a 1400mm i/o 1200 for the long one.

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PostPosted: Sun Mar 19, 2017 10:42 pm 
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Posts: 1619
Location: SYD
melchionda wrote:
Thanks guys... That setup does make sense and looks really simple.

Any recommendations on the cable lenghts I need to buy?

I'm thinking I need to determine these cable lengths...

1.) From the bar end to the lever?
2.) From lever to lever?
3.) From the Downtube junction box all the way up into the handlebar and connected to a brake lever.

I want it to be tidy, but if I get wires too short it could be a real pain in the neck to get these connected.

(I'm running a 56cm frame and 44cm bars.)



1. 350mm
2. 600mm
3. 1400mm ( 1200 will do in a pinch )

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Posted: Sun Mar 19, 2017 10:42 pm 


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