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Old 06-15-09, 10:17 AM   #1
Zap Hassellhoff
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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.
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Old 06-15-09, 10:25 AM   #2
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Yes, all square taper Shimano stuff is the same taper. You should have no issue using this BB.
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Old 06-15-09, 10:37 AM   #3
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that 1mm translates to 0.5mm if the axle spacing is symmetrical
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Old 06-15-09, 06:12 PM   #4
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Thank's all for the replies, I'm looking forward to installing this "new" bottom bracket.
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Old 06-15-09, 06:18 PM   #5
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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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Old 06-15-09, 09:47 PM   #6
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NJS = SSFG guys wet dreams.
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Old 06-16-09, 03:58 AM   #7
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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.
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Old 06-16-09, 07:21 AM   #8
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Yep. I'd sell for $50 and buy a cartridge BB and an extra for another bike.
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Old 06-17-09, 12:11 AM   #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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