Ultegra 6870 & 10 speed backwards compatibility?
Moderator: robbosmans
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.
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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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
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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.
The 6870 and a 10 speed rear might work, but I don't know of anyone who has tried it.
- Tinea Pedis
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Are you referring to 6800 or 6870 (Di2)?
Your OP could be confusing people.
Your OP could be confusing people.
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- Tinker, Taylor, Tart
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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.
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.
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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- Tinker, Taylor, Tart
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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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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.
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.