Thread: Bottom bracket threading, explain it to me.
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Old 06-22-25 | 07:55 AM
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Originally Posted by JohnDThompson
Yes, both the cups and the shell. Not to mention, the Whitworth thread angle and profile used with Italian thread spec.
I hadn't realised they use Whitworth thread form, so more likely British machine tools than American, and possibly pre-WWII?
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