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DA 7400 to 7700

Old 03-26-15, 08:32 AM
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slebo3213
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DA 7400 to 7700

I can get a good deal on a DA 7700 wheelset, and I'm wondering if I can slide my 7400 cassette from my 7402 wheelset onto it? I believe the freehub design changed between these two series, and I read the article on Sheldon Brown, but I can't get a clear understanding of how/whether I can use the two together.

Any assistance would be greatly appreciated.
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Old 03-26-15, 09:14 AM
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Do a quick check of the small cog. If I remember correctly, the 7402 is a UG (Uniglide) cassette which the small cog threads onto the hub body as functions as a lockring as opposed to the 7700 HG (Hyperglide) cassette which has a seperate lockring. Those are not interchangeable in case you are wondering, outside vs inside threads. I think there was a difference in spline spacing as well. The cog spacing should stay the same or close enough that indexing will still work if you go with the 7700 wheel and a newer cassette.
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Old 03-26-15, 10:21 AM
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slebo3213
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Originally Posted by Antieverything View Post
Do a quick check of the small cog. If I remember correctly, the 7402 is a UG (Uniglide) cassette which the small cog threads onto the hub body as functions as a lockring as opposed to the 7700 HG (Hyperglide) cassette which has a seperate lockring. Those are not interchangeable in case you are wondering, outside vs inside threads. I think there was a difference in spline spacing as well. The cog spacing should stay the same or close enough that indexing will still work if you go with the 7700 wheel and a newer cassette.
Thanks. I'll check that. According to sheldon brown shimano introduced the hyperglide in 1990, and I would've sworn that my 7402 group came around a few years after that.

Shimano Dura-Ace Compatibility
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Old 03-26-15, 10:35 AM
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You can make the distinction visually, do you have twist tooth cogs or the newer chamfered HG style? If the former, you'll need a new cassette (not a big deal, just get a new 8 speed HG cassette). If you have the later you may be able to transfer it over.

A limited google search tells me 7402 came in both hyperglide and Uniglide but that offends my sense of order, I feel like it should have a different model number depending, but nothing is sacred in the bike world.
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Old 03-26-15, 08:23 PM
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Although there are 7 speed HG cassettes, pretty sure none of them are DA. but this is an easy swappo: use the 7700 wheelset by adding a 4.5mm spacer and then a new to you 7 speed HG cassette- there are plenty of those out there.
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Old 03-27-15, 04:54 AM
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You didn't say if your 7400 cassette was 8sp or less. If it's 8-sp, you can use it by simply installing it. If it's 7sp, see Doc's post above.
While 7400 series 8-sp can be smooth as silk (and is), the 7700 series is a higher grade of silk.
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Old 03-27-15, 06:39 AM
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Thanks all. I just checked and the existing 8 speed cassette is marked hyperglide. So, I should be able to just move it over to the new wheel set.
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