Ultegra Di2 6870 derailleur question.

Discussion in 'Bicycle Mechanics and Repairs' started by Gary E, 26 Sep 2017.

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  1. Gary E

    Gary E Veteran

    Location:
    Hampshire
    I currently have an Ultegra Di2 6870 SS (short cage) derailleur fitted but I'd like to increase the size of my cassette. Unfortunately, to do this, I'll need a GS (medium cage) derailleur.

    I'm assuming (and stand to be corrected) that the main part of the derailleur is identical on both and that the only difference is the length of the cage plates?

    If this is the case, can I simply purchase and swap the cage to turn my SS into a GS?

    At £147 for a new GS I'm looking at other (cheaper) options!
     
  2. Globalti

    Globalti Legendary Member

    No you can't buy the cage.
     
  3. OP
    OP
    Gary E

    Gary E Veteran

    Location:
    Hampshire
  4. bikingdad90

    bikingdad90 Formerly chris harte

    Looks like you also need part 7. The inner and outer are 8 and 11.

    See the part diagram on the website.
     
  5. OP
    OP
    Gary E

    Gary E Veteran

    Location:
    Hampshire
    I can see the link for the parts list but unfortunately it won't open on my iPad :sad:
     
    Last edited: 26 Sep 2017
  6. Globalti

    Globalti Legendary Member

    Blimey. I stand corrected.
     
  7. OP
    OP
    Gary E

    Gary E Veteran

    Location:
    Hampshire
    Thanks for that bikingdad90, good spot.

    Just managed to get the parts list to open and you're right, the only parts that differ between the SS and the GS are item 8, the Inner Plate, item 11, the Outer Plate and item 7, the Plate Axle Assembly.

    Just ordered all 3 :smile:
     
    Ajax Bay likes this.
  8. rob01792

    rob01792 Über Member

    Location:
    swansea
    Any links for item 7 as i cant open the list
     
  9. OP
    OP
    Gary E

    Gary E Veteran

    Location:
    Hampshire
    https://www.sjscycles.co.uk/gear-sp...rd6870-plate-axle-assembly-gs-type-y5yd98030/
     
  10. OP
    OP
    Gary E

    Gary E Veteran

    Location:
    Hampshire
    If you want the parts specifically for the medium cage (GS), Di2 version of the RD-6870 then use the links above. But if you want the short cage (SS) version or the mechanical version be careful as the parts vary between models.

    Shimano Part Numbers for the 3 parts needed for the Medium cage (GS), Di2 RD-6870 are:

    Y5YC225000 - Inner Plate
    Y5YC98080 - Outer Plate
    Y5YD98030 - Plate Axle Assembly

    Whilst I can't personally confirm that these are all of the parts needed (as I haven't received them yet) I did call the technical helpline at SJS and was told that this was the case :smile:
     
    Last edited: 27 Sep 2017
  11. rob01792

    rob01792 Über Member

    Location:
    swansea
    Thanks for that
    im running di2 ss at moment so just what i need
     
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