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Dura Ace hubs. Differences?

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Dura Ace hubs. Differences?

Old 05-26-10, 11:39 AM
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20grit
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Dura Ace hubs. Differences?

I've just picked up a dura ace front hub. I can't seem to tell the difference between 7400 and 7700. are there any differences?
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Old 05-26-10, 11:45 AM
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300.
haha, I don't know.
my '76 fuji track bike has an old dura ace njs track hub, I don't know the model # or year:

I'm pretty sure this was of little help.
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Old 05-26-10, 11:48 AM
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hehe, it's pretty. but i have a low flange road hub
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Old 05-26-10, 11:51 AM
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Very slight differences. The most obvious are that the 7400 have black locknuts and darker black "Dura Ace" (the script is the same) where the 7700 have silver locknuts and a less dark "Dura Ace". The 7800 are much thicker. And the skewer nut on the 7700 does not have the loop (but skewers can change)

7700:


and:



7400:


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Old 05-26-10, 12:15 PM
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Also the logo on the 7400's are engraved into the shell...I believe the later ones have the logo screened on.
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Old 05-26-10, 12:20 PM
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Ah, I guess I have a 7400 one then. Gotta open it up. It arrived today described as lightly used. To say it spins a little rough might be an understatement.
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Old 05-26-10, 12:25 PM
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Aren't those sealed bearings in the 7400's ?
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