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Old 03-29-20, 08:39 AM
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Originally Posted by loubikes View Post
Thanks bikemig, I actually have the BB off now ... EXCEPT for the fixed cup. I have now broken two 1/2 bolts trying to remove it using Sheldon Brown's suggested method for BB removal. Really wondering if it's Swiss but I can feel the threads from the other side and I'm 99.9% certain they are right-hand threads.
Are there any markings on the fixed cup face? If you're lucky, they will explicitly give the thread spec: "35 x 1" for French; "35 x 1 P1 S1" for Swiss. But older components may have more arcane markings:

Source: Sutherland's 4th Edition
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