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  1. #1
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    Dura-ace Square Taper Bottom Bracket

    Hey all,

    I recently acquired a Dura-Ace 7400 series bottom bracket 68x112. This is the adjustable, square taper type. I would like to use this BB as a replacement for the square taper Shimano 68x113 UN52 that is on my Trek 1200. I'm currently using an older RX-100 crank set.

    The Dura-Ace BB is stamped with "NJS" on one of the cups. I researched Sheldon' site and understand that "NJS" is a manufacturing standard but other than that should there be any issues regarding taper of the axle? Sheldon seems to indicate NO but I just wanted to double check.

    In short, does shimano = shimano when it comes to parts interchangeability, i.e. does the Dura-Ace axle and the UN52 axle share the same tapers?

    As a side note, I'm not worried about the 1mm difference in axle width; I'll have enough clearance on the frame to "tune" that out.

  2. #2
    Senior Member demoncyclist's Avatar
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    Yes, all square taper Shimano stuff is the same taper. You should have no issue using this BB.
    DEMON

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  3. #3
    AEO
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    that 1mm translates to 0.5mm if the axle spacing is symmetrical
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
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    Thank's all for the replies, I'm looking forward to installing this "new" bottom bracket.

  5. #5
    slow as I ever was Ex Pres's Avatar
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    NJS = bigger bucks than a regular one. If I were you I'd sell that DA BB and buy 2(or more) brand new UN54s.

    If it was Italian I'd buy it from you.
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  6. #6
    cab horn
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    NJS = SSFG guys wet dreams.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  7. #7
    Senior Member z415's Avatar
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    Quote Originally Posted by Zap Hassellhoff View Post
    The Dura-Ace BB is stamped with "NJS" on one of the cups. I researched Sheldon' site and understand that "NJS" is a manufacturing standard but other than that should there be any issues regarding taper of the axle? Sheldon seems to indicate NO but I just wanted to double check.
    Not 100% because I gave up on my fixed gear project, but NJS is not *just* a standard, but a standard for track racing - true crazy Japanese keiran style track racing. Like previous posters have mentioned, it might fetch you a relatively pretty penny.
    Falling is learning...[SIGPIC][/SIGPIC]...learn to not fall in a box.
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  8. #8
    Your mom
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    Yep. I'd sell for $50 and buy a cartridge BB and an extra for another bike.

  9. #9
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    Actually, I bought this on Fleabay for $15. I currently have a cartridge BB on my '91 Trek 1200. While I like cartridge BB's, there is something I enjoy about the fact that I can take the old adjustable units out and do my own maintenance.

    I

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