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  1. #1
    Senior Member Silverexpress's Avatar
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    ISIS equivalent for Shimano BB-UN52

    Hello,

    I have Ritchey WCS MTB crankset laying around that I'd like to install on my Bridgestone XO-4. The original BB on this bike is a Shimano BB-UN52 68x107 with an Alvio triple crankset.

    The WCS crankset takes an ISIS BB, so would anyone know what the equivalent ISIS size would be?
    Regards,
    Jose

  2. #2
    Senior Member demoncyclist's Avatar
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    Oct 2002
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    Medway, MA
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    2011 Lynskey Sportive, 1988 Cannondale SM400
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    It isn't about equivalent sizes, it is about the proper spindle length to work with the WCS crankset. I would start at the Ritchey website and see what they recommend for that crank
    DEMON

    Satanic Mechanic
    STAR 3 Spinning Instructor

    2011 Lynskey Sportive (Shimano Ultegra 10s)
    1988 Cannondale SM400 (Suntour XC-M 7s)

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