Changing Di2 Deurailler

Discussion in 'Bicycle Mechanics and Repairs' started by steveindenmark, 28 Dec 2018.

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  1. The 10 speed di2 Ultegra deurailler is broken and is now obsolete. I am going to change it to the new 11 speed Ultegra deurailler.

    I am not totally sure how to do this but Im willing to try.

    I know I will need to find a wheel that will take an 11 speed cassette and an 11 speed chain. I dont think I will need to change the levers.

    The thing I am not sure about is do I need to change the front deurailler as well?

    Any help will be appreciated.
     
  2. DCBassman

    DCBassman Basses or Bikes? Hmmm...

    Location:
    Tavistock
    Sounds expensive...
     
    fossyant likes this.
  3. jowwy

    jowwy The bearded Powerhouse

    You would need 11 speed shifters too.....otherwise you will only have 10 clicks available

    And yes you can’t mix 10/11 speed so new front derailleur too
     
  4. JhnBssll

    JhnBssll Über Member

    Location:
    Suffolk
    Your current shifters will be fine, all di2 eTube shifters are compatible with each other. You will need a new 11 speed compatible front mech. You will almost certainly need to update the firmware of all the current components to work with the new mechs.

    Lots of info and compatibility available on the Carlton bale site :okay: https://carltonbale.com/shimano-di2-everything-you-need-to-know/
     
    Milkfloat and raleighnut like this.
  5. OP
    OP
    steveindenmark

    steveindenmark Guru

    Yes I think so. About £400- £500. But it is a nice bike and would be a shame just to leave it.
     
  6. DCBassman

    DCBassman Basses or Bikes? Hmmm...

    Location:
    Tavistock
    Absolutely. But 'ouch'!
     
  7. OP
    OP
    steveindenmark

    steveindenmark Guru

    For sure. My other option is to just find a rear deurailler and replace that along with the chain, cassette and chain rings, which all need replacing. Its an interesting project though.

    One of my new years resolutions is to learn more about bike mechanics. Here is my chance
     
    BlueDog likes this.
  8. IanSmithCSE

    IanSmithCSE Senior Member

    Good morning,

    I have 10 speed Di2 and this is a question as I genuinely don't know if it is an issue or not, aren't 11 speed Ultegra chainrings a teeny bit closer together than 10 speed ones?

    With manual shifting it is easy to say yes but it is such a tiny amount it doesn't matter, is this still true with Di2 where the shift is a pre-programmed amount and the 11 speed FD is expecting an 11 speed chainset?

    Bye

    Ian
     
  9. OP
    OP
    steveindenmark

    steveindenmark Guru

    Ian. As far as I have made out up to now. If you change 10 speed di2 rear deurailler to an 11 speed. You also need an 11 speed cassette, 11 speed chain and the correct front deurailler to match the rear.

    You do not need to change the levers.

    You cannot just change the 10 speed deurailler for an 11 speed and hope it runs smoothly. It wont.

    It is reported that the Shimano RD 6770 rear deurailler are hard to find but there are a few on ebay. I cannot find a new one though.
     
  10. IanSmithCSE

    IanSmithCSE Senior Member

    Good evening,

    I agree with all of what you have said. :-)

    But....... I love the little whirr as the front mech moves and it moves a fixed amount, there are no sensors.

    A 10 speed chainset has a bigger gap between the chain rings than the 11 speed, I think that it is about 1mm, so does it matter, I don't know?

    If this gap does matter then changes made by the FD on the chainset may result in the 11 spd FD "thinking" that's enough and on a 10 spd chainset leaving the chain half on and half off the big ring.

    This was my should I or shouldn't I post https://www.cyclechat.net/threads/g...enith-pro-carbon-ultegra-di2-10-speed.235754/

    Bye

    Ian
     
  11. IanSmithCSE

    IanSmithCSE Senior Member

    Carrying on,

    I don't think that Di2 was ever really designed to be a mix and match groupset.

    The price is so high that it was probably intended to be supplied to people who would "buy this year's version" and then buy "next year's version".

    I have a fond memory of Simplex gear levers with a Shimano 600 rear mech and a Campag Nouvo Gran Sport front mech and a Regina freewheel, the market has moved on, forwards or backwards maybe!

    Bye

    Ian
     
  12. avsd

    avsd Veteran

    Location:
    Belfast
    IanSmithCSE likes this.
  13. For a while I was running 11 speed rear mech (obviously with 11 speed wheel and cassette) but everything else was 10 speed. You have to be careful though, as after one of the updates to the firm ware you can only run 10 speed front and rear mechs together and the same for 11 speed, you could not mix and match. Levers will work with any combination.
     
  14. CXRAndy

    CXRAndy Veteran

    Location:
    Lincs
    Look up Shimano etube project compatibility chart. IT lists what components can work with what. Have you considered using MTB derailleurs to allow for greater (wider) gearing selection. Derailleurs are either 10 or 11 speed you can't mix match the two. You have an option to go triple with XTR Di2 front derailleur
     
  15. IanSmithCSE

    IanSmithCSE Senior Member

    Good morning,

    Thank, that's good to know.

    I was wondering if the reason that 10spd FDs were made incompatible with 11spd RDs is that although they worked they didn't work as well as expected. For example occasional dropped chains as the FD throw was too great or the self trimming worked only most of the time.

    Its one of those things that only living with it for a while can tell you.

    Bye

    Ian
     
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