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  • This topic has 4 replies, 4 voices, and was last updated 13 years ago by Rik.
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  • Road long cage rear mechs – why only 27t largest sprocket?
  • Rik
    Free Member

    Why are shimano long cage rear mechs only have a max sprocket of 27t rather than a mtb rear mech of 34t?

    Would like a long cage ultegra rear mech with mtb 32t cassette for touring.

    What’s different with the mech?

    Posted 13 years ago
    druidh
    Free Member

    ultegra does 28t

    Posted 13 years ago
    mtbfix
    Full Member

    Something to do with the parallelogram of the mechs. Run a road mech with a too big sprocket and the top jockey wheel clashes so will not shift properly.

    What would be the issue with running an XT mech or similar for the purposes of touring?

    Posted 13 years ago
    Oggles
    Free Member

    The linkage geometry is different on an MTB mech. The cage has to swing lower to accommodate a 34T sprocket.

    Posted 13 years ago
    Rik
    Free Member

    No problem at all running an XT mech or mtb mech. Just I have a full ultegra groupset, so wanted to keep it all the same.

    Thought it might be the linkage…..shame

    Posted 13 years ago
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