Shimano BBUN-73 cartridge bottom bracket

Discussion in 'Cycling Equipment' started by Mikeyankee, Jun 29, 2003.

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  1. Mikeyankee

    Mikeyankee Guest

    Just installed a new BBUN-73 and was curious about the black ring pressed on to the drive-side
    spindle just inside of the tapers, which was not on the previous BBUN-72 model. Anybody know
    its purpose?

    Mike Yankee

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