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  1. Unlikely-Office-7566 on

    Square taper. Probably a cartridge. Measure the width of the frame (most likely 73mm) and spindle to determine your replacement.

  2. GenericName187 on

    You need a 20 spline tool to remove the cartridge bottom bracket. Park Tool BBT-22 or BBT-32, or any other reputable brand will do.

    When you remove the bottom bracket hopefully the shell width (68 or 73 mm) and spindle length (between 103 and 127 mm, probably around 122.5 mm).

    The drive side cup is reverse threaded, you will turn clockwise to loosen.

    https://www.parktool.com/en-us/blog/repair-help/bottom-bracket-removal-installation-threaded

    https://www.parktool.com/en-us/blog/repair-help/bottom-bracket-tool-selection-threaded-and-thread-together

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