• I'm surprised it happened at all to be honest. At my last place, not only did we have dummy bbs to double check the threading before the frame was brazed, but the BB shell was chased with taps when the frame was finished. So any threading issues would be apparent before the customer received the bike.
    But in any case, I'm not defending Isen. Just that without showing proof, anybody can just say anything on the internet.

  • the BB shell was chased with taps when the frame was finished.

    Precisely. You always chase threads after the hot work is finished in case any distortion has affected the tolerances. If frames were leaving the shop with wrong threads, it's because this basic production step was skipped.

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