Yeah, it bugs me that no one talks about which cartridge square-taper BB's have symmetrical and which have asymmetrical spindles.
You'd think Shimano would have a list of this or something.
107 is symmetrical
110 non-ds 3mm longer
113 non-ds 2mm longer
115 symmetrical or very close
This is the case for Shimano BB's and for Nashbar copies, and everything I've seen in the sealed-cartridge-bb world that's designed to be Shimano-compatible.
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"c" is not a unit that measures tire width