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  1. #1
    Senior Member word_nerd's Avatar
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    How do you measure a BB spindle length, when the ends are threaded?

    So i'm looking at fixing up my old ten speed. i want to get a new crankset, but i want to reuse the bottom bracket. one of the cranksets i'm looking at says it's best used with BB spindles between a certain length range. i looked on Sheldon Brown (BB size database) and found it overwhelming, especially since i don't know the make/model of the BB and i haven't taken the whole thing apart yet. This graphic makes sense, but my BB has threads that extend beyond the square taper, like the one pictured here. So would i measure the distance from end to end to get the proper dimension, or would i measure from the end of the square tapers?

    i hope this makes sense. Thanks in advance for your help.
    1984 Puch Classic, best $5 i ever spent!

  2. #2
    AEO
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    Senior Member AEO's Avatar
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    for those funky BBs, you don't measure the threaded portions.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
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  3. #3
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    You have what is known as a "nutted spindle". You measure from the base of each threaded stub, ignoring the threaded portion. That will give you the same measurement as the required bolted spindle.

  4. #4
    Senior Member word_nerd's Avatar
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    Thanks, ya'll.
    1984 Puch Classic, best $5 i ever spent!

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