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  1. #1
    Junior Member
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    600 Chainring replacement

    I currently have a Shimano 600 double crankset with 53/42 chainrings. I want to change the 42 to a 39. Will an Ultegra chainring fit? Or does anyone know where I can buy one for the 600 crank?

    Thanks in advance

    Albert

  2. #2
    Senior Member
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    Your LBS should have a chart to measure the hole pattern on the 600. I thin, but am not certain, that it is 130mm. But you also have to match the number of bolt holes 4, 5 or 6. Most Shimano's, are 5, but they do have 4.

    So, IF the size and bolt hole pattern is the same as Ultegra, it will fit. In fact, any chainring with the same size and bolt hole pattern will fit. The thing to remember is to keep the Spacing Between the chainrings the same for proper shifting.
    ljbike

  3. #3
    RetroGrouchWrench Rural Roadie's Avatar
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    The model number on the back should read FC-6207, at least thats what my nos 600 EX crank says on it, even the FC-6400 series cranks should be 130 bolt circle diameter if its a double.
    Hope this helps.
    kev

  4. #4
    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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    If your crankset is less than 20 years old, it will have the standard 130mm BCD, and the 39-tooth ring will mount onto the spinder. Your biggest concerns will be shifting in front with the larger jump, and the ability of your rear derailleur to take up the slack in back. If you have only 6 or 7 cogs in back, you may also pick up some redundant ratios. My suggestion: replace the 53 with a 50 when you replace the 42 with a 39.
    "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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