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Old 02-24-09, 12:09 PM
  #17  
Mondoman
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Location: A Latvian in Seattle
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The square-taper/octalink/whatever are only differences in the spindle and determine what cranks will fit; it's the threading and size of the BB shell/hole in the frame that determines what type of BB will fit. 68mm (or sometimes 73mm) BB shell width and English threading have been pretty standard in the US for a loooong time, so you can just mount a BB that fits that and be good to go.

The external bearing type BBs such as your second choice above also require that the outer faces of the BB shell be parallel (or veeery close) or the BB will get stressed and often fail prematurely. If you go that route, I'd suggest having an LBS with the proper (expensive) tools and knowledge "face" the BB shell just to make sure it's nice and flat and parallel. This isn't normally so big an issue with the all-internal BBs such as your first choice above.

I agree with operator that something like your first choice will last a long time and work fine for you.
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