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  1. #1
    Senior Member
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    What kind of BB do I have?

    I have two older Japanese bikes: A Fuji from 1977 and a Panasonic from the early 80's. While the Fuji came with cottered cranks, both shells seem to be threaded the same, as I can interchange the cups: Fixed cup is left threaded; adjustable is normal. The Fuji is 68mm wide; the Panasonic is 70mm. The diameter, best I can measure (no calipers) is 34mm. I can't make these measurements fit Sheldon's table (which has no "Japanese" entry). Closest fit would seem to be Swiss?!? Anyone have good knowledge on what these might be? Or do I need to bring it in to a shop to have a "pro" tell me? Trying to figure out what my replacement options are, if any...

  2. #2
    A little North of Hell
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    British/I.S.O.
    1.37/1.375" x 24 tpi
    (34.8/34.9 x 1.06 mm)
    [SIGPIC][/SIGPIC]
    XXXI

  3. #3
    Senior Member
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    Thanks. You sound pretty certain -- yes? And is this the "default" or easy to find variety? Is the 2 mm width difference a problem, or is that easily handled by the adjustable cup?

  4. #4
    Senior Member
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    British/ISO is almost universal these days and I don't think the Japanese have ever used anything else.

  5. #5
    Old fart JohnDThompson's Avatar
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    If the cups are interchangeable, they're both English thread. Swiss thread would be highly unlikely on a Japanese bike in any case. The shell width does not matter provided you use an appropriate spindle for the bike.

  6. #6
    Senior Member
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    Thanks, all!

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