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Old 07-15-11, 04:19 PM   #1
word_nerd
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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.
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Old 07-15-11, 04:31 PM   #2
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for those funky BBs, you don't measure the threaded portions.
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Old 07-15-11, 06:36 PM   #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.
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Old 07-15-11, 07:33 PM   #4
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Thanks, ya'll.
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