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PostPosted: Sun Oct 20, 2013 8:12 pm 
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Joined: Fri Apr 13, 2012 7:25 pm
Posts: 87
So, if I had a 6870 Di2 rear derailleur and a rear wheelset with a 10-speed cassette, could I make it run?

I think I have heard that the 6870 Di2 levers would work with a 6770 RD & FD.

I would like to get the 6870 groupset for my main bike, but switching all my wheelsets to 11 speed would break my economy and it would make me sad getting a new 6770 group when the 6870 is out.


Last edited by jockster on Tue Oct 29, 2013 10:56 pm, edited 1 time in total.

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PostPosted: Tue Oct 29, 2013 2:54 pm 
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Joined: Fri Apr 13, 2012 7:25 pm
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Anyone?


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PostPosted: Tue Oct 29, 2013 6:19 pm 
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Joined: Mon Oct 10, 2005 1:19 am
Posts: 236
Location: Central PA
Yes. Check out the last paragraph here... http://velonews.competitor.com/2013/09/bikes-and-tech/technical-faq/technical-faq-drivetrain-compatibility-for-10-and-11-speed_301392

-efwd


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PostPosted: Tue Oct 29, 2013 6:21 pm 
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Joined: Tue Jun 12, 2012 4:40 pm
Posts: 161
Levers from any version of di2 (except 7900) will work with any front or rear mech. This applies to 6770, 6870 and Dura Ace 9070. You will need the latest firmware in all components for it to work.

The 6870 and a 10 speed rear might work, but I don't know of anyone who has tried it.


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PostPosted: Tue Oct 29, 2013 6:35 pm 
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Posts: 236
Location: Central PA
D'oh! Somehow I read that too fast and missed the Di2 part. Still, what dha said...

@dha - Thank you for the backstopping!


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PostPosted: Tue Oct 29, 2013 10:28 pm 
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Joined: Sat Mar 14, 2009 6:08 am
Posts: 8226
Location: Geelong
Are you referring to 6800 or 6870 (Di2)?

Your OP could be confusing people.

_________________
http://www.nicksquillari.com.au


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PostPosted: Tue Oct 29, 2013 10:57 pm 
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Sorry. All about 6870 here - corrected my first post for clarification


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PostPosted: Thu Oct 31, 2013 8:26 am 
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Joined: Mon Dec 24, 2012 6:42 am
Posts: 34
I'm running 6800 shift levers with my 10 speed wheels without a problem. The throw distance is the same so it just works. Eventually I'll move all my wheels to 11sp but for now it beats having waste good hubs by replacing with 11.


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PostPosted: Thu Oct 31, 2013 12:39 pm 
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Tinker, Taylor, Tart

Joined: Sat Nov 29, 2008 8:00 pm
Posts: 1836
Location: Sydney, Aus.
If you can change your freehub to Campag, do that and run Campag cassettes - I'm using 9070 Di2 on a Chorus cassette and it works perfectly.


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PostPosted: Fri Nov 01, 2013 10:39 am 
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Posts: 34
BikeTart wrote:
If you can change your freehub to Campag, do that and run Campag cassettes - I'm using 9070 Di2 on a Chorus cassette and it works perfectly.



Thanks for that! very interesting. You just saved me from rebuilding wheels for the price of a cassette.


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PostPosted: Mon Nov 04, 2013 9:09 pm 
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@gjash - Do you have a 6800 rear derailleur as well?


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PostPosted: Tue Nov 05, 2013 6:55 am 
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jockster wrote:
@gjash - Do you have a 6800 rear derailleur as well?


Yes, that's right.


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PostPosted: Wed Nov 06, 2013 5:28 pm 
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Posts: 87
dha wrote:
Levers from any version of di2 (except 7900) will work with any front or rear mech. This applies to 6770, 6870 and Dura Ace 9070. You will need the latest firmware in all components for it to work.

The 6870 and a 10 speed rear might work, but I don't know of anyone who has tried it.



So one would most probably be fine running a 10sp cassette with 6870 levers and rear derailleur then?


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PostPosted: Wed Nov 06, 2013 8:40 pm 
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Tinker, Taylor, Tart

Joined: Sat Nov 29, 2008 8:00 pm
Posts: 1836
Location: Sydney, Aus.
It's the rear mech that determines whether the system 'thinks' it's 10 or 11spd. If you run a 6870 rear mech the system will think it is 11spd - then the only way to run it 10spd is to wind in a limit screw to stop it reaching the 11th sprocket.


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PostPosted: Thu Nov 07, 2013 1:11 pm 
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Joined: Wed Mar 17, 2004 1:38 pm
Posts: 1464
In that scenario the shifting will not be perfect since the 6870 RD will be shifting to 11sp cog spacing. If you want 10sp cassettes, you will need a 6770 RD and can use 6870 everywhere else.

The RD determines the the cog setup. 6770 = 10sp 6870 = 11sp. All other components are compatible, though not optimal. The 6870 FD will trim based upon 11sp chain and chainring architecture, so you may have some misalignment, though you won't know how much until you try it.


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