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  1. #1
    Member SpotmaticF's Avatar
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    Changing 42 to 39 on Triple Crank

    Hello:

    On my road bike I've got a Cannondale EX (2001) triple crank with 52,42 and granny chainrings.

    I do not use the granny and want to swap the 42t to a 39t inorder to reduce redundant gear ratios (and get some lower ratios for the hills).

    I am not sure which 39T shimano (or equiv) chainrings I need as there appear to be two versions with diff pick-up pin locations.

    Would there be any benefit to getting a 53T ring at the same time (other than taller gearing)?

    FYI I plan to buy 105 or Ultegra rings (or equiv), Unless someone can convince to me that DuraAce ring are worth the cash.

    Thanks,

    Matt
    Last edited by SpotmaticF; 11-13-02 at 02:45 PM.

  2. #2
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    Shimano says that A type rings and B types have to be used together.In actual practice it makes little or no difference.

  3. #3
    Member SpotmaticF's Avatar
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    so, if I have a Cannondale EX triple crank, with Cannondale rings 52-42-3X, what Shimano type replacement rings do I need, A or B?

    Thanks.

  4. #4
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    either. Since you say you will seldon shift from the granny to the middle anyway it won't matter.

  5. #5
    feros ferio John E's Avatar
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    1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
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    I cannot speak regarding Shimano, but I have found no significant difference between Campag.'s "A" and "B" rings.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

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