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PostPosted: Mon Oct 05, 2015 1:26 pm 
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Joined: Mon May 04, 2015 8:22 pm
Posts: 205
I came across a post on WW where someone stated 11 speed DA Di2 shifters worked flawlessly with Ultegra 11 speed Di2 parts. I can't seem to find that post anymore.

Could someone tell me more about the (in)compatibility of different parts?


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Posted: Mon Oct 05, 2015 1:26 pm 


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PostPosted: Mon Oct 05, 2015 1:31 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
Posts: 1239
Location: Canada
They do. No issue. Of course as a matter of practice, always ensure you've got latest firmware for all components.

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PostPosted: Mon Oct 05, 2015 2:15 pm 
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Joined: Thu Jun 03, 2010 12:47 pm
Posts: 88
It works. Even Ultegra 6770 shifters do work with 11sp Ultegra (6870) and Dura Ace (9010)!

Just make sure you are using the latest firmware.


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PostPosted: Mon Oct 05, 2015 6:19 pm 
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Posts: 205
So I can even buy a set of used 6770 shifters with a 11 speed derailleur?

Is it also possible to upgrade a 10 speed derailleur to 11 speed through firmware?


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PostPosted: Mon Oct 05, 2015 6:28 pm 
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Joined: Fri Jun 01, 2012 3:00 pm
Posts: 141
Location: San Sebastian
jorisee01 wrote:
So I can even buy a set of used 6770 shifters with a 11 speed derailleur?

Is it also possible to upgrade a 10 speed derailleur to 11 speed through firmware?


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St-6770 with 11 speed derailleur? Yes, I have used st-6700 with Fd-6870 and Rd-9070


Is it also possible to upgrade a 10 speed derailleur to 11 speed through firmware? It is not possible to update


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PostPosted: Mon Oct 05, 2015 6:37 pm 
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Ok thanks. Clear.


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PostPosted: Mon Oct 05, 2015 7:58 pm 
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Joined: Thu Jun 09, 2011 4:10 pm
Posts: 432
Di2 compatibility down to a few rules

1) if its not e-tube, it only works with itself. See Dura-ace 7970.
2) Match the derailleurs for discipline, and speed. (road vs mtb, 10 vs 11 speed) (older firmware versions can mix 10s and 11s, but shimano patched that out)
3) Use any shifters, batteries or junctions you want assuming you update the firmware. Old external batteries need to be updated with an older programmer once -most shops with the box will do it for free/beer money. afterwards you can use the newer interface.
4) plug whatever you want into any port (except the keyed sprint shifter ports on the ST-6870/9070 STI shifters)
5) Use only one battery.


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PostPosted: Mon Oct 05, 2015 8:01 pm 
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Thanks aaric! Very helpful!


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PostPosted: Mon Oct 05, 2015 11:16 pm 
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Joined: Thu Jun 09, 2011 4:10 pm
Posts: 432
Forgot one:

6) You need at least one A junction in the system (the junction with the button to put it into adjust mode). You can run multiple A junctions, but shimano's software won't let you muck with any settings with more than one A junction connected.


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PostPosted: Tue Oct 06, 2015 8:31 am 
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Joined: Sat May 02, 2015 10:11 pm
Posts: 521
I have a 6770 10-speed ultegra groupset, that I'm using with 11-speed 9070 dura ace shifters. Works perfectly. Didn't do any update or anything. Just plug and play.


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PostPosted: Mon Oct 12, 2015 9:05 pm 
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Posts: 205
Is it possible to use the SM-ew67 junction with the 11 speed derailleur if you use an external battery?


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PostPosted: Mon Oct 12, 2015 9:18 pm 
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Posts: 432
Yes. There's a Felt AR thread where SuperDave (A Felt's PR guy) documents it working, as the ew67 is easier to hide.


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PostPosted: Mon Oct 12, 2015 9:22 pm 
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Posts: 205
You mean this thread? http://www.tririg.com/articles.php?id=2 ... ing&page=3


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PostPosted: Mon Oct 12, 2015 10:32 pm 
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Joined: Thu Jun 09, 2011 4:10 pm
Posts: 432
thought it was in viewtopic.php?f=3&t=118212&hilit=junction, but I can't seem to find it now...


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Posted: Mon Oct 12, 2015 10:32 pm 


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PostPosted: Mon Oct 12, 2015 10:34 pm 
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Joined: Thu Jun 09, 2011 4:10 pm
Posts: 432
Regardles, http://e-tubeproject.shimano.com/pdf/20 ... art_en.pdf says it will work.

And I bet it would work with an internal battery, you'd just not be able to charge it :shock:


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