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.