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  1. #1
    Nighttime Rider
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    Help me interpret the numbers in my bottom bracket.

    The numbers show:

    CH51-68
    113.5L
    BC1.37x24T

    Thanks

    CE

  2. #2
    Senior Member
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    RUN! ITS GONNA BLOW!

    Oh.

    68 millimeter Width for the BB itself.
    113.5 spindle length. The L might mean the left side is longer than the right.

    1.37x24t is standard 'Euro' thread.

  3. #3
    * vpiuva's Avatar
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    51 may be the distance in mm between the races on the spindle

  4. #4
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    Quote Originally Posted by TO11MTM
    RUN! ITS GONNA BLOW!

    Oh.

    68 millimeter Width for the BB itself.
    113.5 spindle length. The L might mean the left side is longer than the right.

    1.37x24t is standard 'Euro' thread.
    Correct except the 1.37x24t is actually known as "English", "BS" (British Standard) or ISO threading and is by far the most common type now.

    There really is no "Euro" threading. You used to have English, italian, French, Swiss and Raleigh's proprietary threading. They were all Euro in one way or another

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