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  • 7 speed cassette and mech with 8 speed shifter. Can it be done?
  • alexpalacefan
    Full Member

    As above really, is the gap between the sprockets the same, such that the 'pull' of the shifter will move the derailleur the right distance?

    If so, I guess start indexing with the shifter in 7, and 8 will be a redundant click, with the limit screw stopping the mech dropping the chain off the bottom of the cassette?

    Cheers, all advice gratefully received.

    Alex

    Posted 14 years ago
    rolfharris
    Free Member

    Yep, that'll work fine.

    Posted 14 years ago
    Ogg
    Full Member

    Spacing is 0.2mm different from 7 speed to 8 speed by the looks of it
    http://www.sheldonbrown.com/k7.html#spacing
    so you should only be out by upto 0.6mm in 1st and 7th gear so sounds do-able.
    No practical experience though!

    Ogg

    Posted 14 years ago
    scaredypants
    Full Member

    what ^ they said (especially Ogg)

    make the central sprocket the one that lines up perfectly, not the smallest as you might for perfectly matching shifter

    Posted 14 years ago
    alexpalacefan
    Full Member

    OK, so index from the middle, and it might get a bit jumpy at the extremes. Ta.

    Rolfharris, have you any experience?

    Cheers

    Alex

    PS, Ogg is that you?

    Posted 14 years ago
    Junkyard
    Free Member

    Done it an dyou have to accept a little skip in one gear 4 th in mine but a half click of old STI shifter sorts it
    Yes it can be done index is a bit more fidllely (spell?)to get it working OK.

    Posted 14 years ago
    Ogg
    Full Member

    PS, Ogg is that you?

    Yes it is – cheers for the loan of the room last weekend!

    Posted 14 years ago
    alexpalacefan
    Full Member

    No worries, and thanks for the spot-on advice. Gonna see if I can blag a 7 speed unit from the parts bin at the office.

    A

    Posted 14 years ago
Viewing 8 posts - 1 through 8 (of 8 total)

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