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Quick technical query - rear derailleur compatability

(2 posts)
  • Started 8 years ago by Mandopicker101
  • Latest reply from Arellcat

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  1. Mandopicker101
    Member

    Hello

    In a moment of haste, I've acquired a 105 5701 short-cage rear mech from Evans in their clearance sale.
    Evans quote it as being able to handle up to a 32t rear sprocket (I'm running 11-32)....but I just noticed EBC and CRC state 30t as the max capacity.

    My set up is a 48/39 double with a 9 speed 11-32 cassette. By my calculations, I'm within the overall capacity of the 105 mech but a wee bit concerned I made a boo-boo by not noticing the max sprocket size. Should I be cancelling the order? Or will it work fine?

    Here's the spec on Evans

    Posted 8 years ago #

  2. Arellcat
    Moderator

    The RD-5701 comes in SS (short cage) and GS (long cage) versions. The GS also comes in two versions, one for double and one for triple chainsets. I'm assuming yours is the SS model? Evans' picture looks like the SS, but the description is for GS.

    According to Shimano, the SS will only go up to a 30t sprocket, and has a total capacity of 34 teeth which is otherwise fine for your application.

    Only the GS for double chainsets accommodates a 32t. Cranking down on the angle of dangle screw might liberate enough space between the upper jockey wheel and the 32t, but it might still be a bit graunchy, and if it worked it would also make the shifting across the smaller sprockets a bit ponderous.

    Posted 8 years ago #

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