Cassette range for 7970 di2

ClaudeH
ClaudeH Posts: 78
edited April 2014 in Road buying advice
I am doing the Marmotte and need to change my gearing as I currently have a 12-25 with a 50/34. I see that the official spec for the 7970 rd is for a max 27t sprocket. Does anyone know if this is really the case in practice? I am sure it will definitely not go higher than 28 which is not a massive difference from 27 but when I am grovelling up alp d'Huez I am sure I will be grateful for any help!

Comments

  • Mccaria
    Mccaria Posts: 869
    Mine runs with a 28 no problems. Haven't tried it on anything larger !
  • arlowood
    arlowood Posts: 2,561
    Why not just buy a cheap Tiagra 12-30 and give it a go to see if it will work.

    http://www.chainreactioncycles.com/shim ... lsrc=aw.ds


    They only cost about £15 so not a great loss if it doesn't - and you can always flog it on here in it's nearly new state.
  • DiscoBoy
    DiscoBoy Posts: 905
    Keep the 25 and just lay off the pies for the next two months :D
    Red bikes are the fastest.
  • ClaudeH
    ClaudeH Posts: 78
    DiscoBoy wrote:
    Keep the 25 and just lay off the pies for the next two months :D

    I think a multi-pronged approach will be needed. Pies and gears!

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