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  1. #1
    Senior Member 55/Rad's Avatar
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    Shimano A and B Type Chainrings

    What's the difference? I was told one was for a double and the other a triple but there's got to be something more....

    Thanks.

    55/Rad

  2. #2
    cycles per second Gonzo Bob's Avatar
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    One is matched up to a 42 inner ring and the other to a 39.

  3. #3
    feros ferio John E's Avatar
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    Quote Originally Posted by Gonzo Bob
    One is matched up to a 42 inner ring and the other to a 39.
    ... and it really does not make any significant difference whatsoever, particularly if you shift properly, by easing up on the pedal load, instead of "power-shifting."
    "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

  4. #4
    Senior Member 55/Rad's Avatar
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    So which is going to work BEST with my 39?

    55/Rad

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