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I'm trying to install a new bottom bracket in a 1973 Fuji S10-S frame and the thing just won't fit.  The BB is a BB-UN26.  It seems the diameter is bigger than what would fit in the hole and the threads don't even appear to have a prayer of catching.

Has anyone else encountered this or know of a different standard BB I should be using?

3 comments

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Welsh boy [699 posts] 4 months ago
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Hi Mike, not a direct answer and I dont want to insult you or your level of knowledge but when you say the thread wont catch, do you know that the drive side bearing is a left hand thread?

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CXR94Di2 [2739 posts] 4 months ago
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If the original BB is as described then supplied part is wrong

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Dingaling [112 posts] 4 months ago
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If the bottom bracket is threaded for the Italian standard then the drive side is a right hand thread, in which case use, for example, BB UN55.