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  • I don't get the whole need to face the BB shell for external BB. Isn't the alignment of the BB dependant on the shell threading, not the face of the BB?

    Am I just complety confused?

  • Interesting point. I can only assume that once you tighten up to 35-40Nm, the threads deform enough to allow the cup face to sit flush against the bb shell, thus putting the bearing at a slight angle.

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