How do I choose a BB ?

one piece crank

Well-Known Member
I've got a 2018/19 Fatboy (M5 AL frame). BB is in good shape, but I want to get have a spare on-hand this Winter. What am I looking for - anything that meets the BB width and spindle diameter, or are there better brands and brands/models to stay away from?

Or, do I just buy new bearings to replace when the current ones wear out (reusing the threaded cups)?
 
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