My bike is a Coppi Wing with a 7800 Dura-Ace group. My cassette is a 10-speed Tiagra CS-5700. I have to replace my freehub. Will a Dura-Ace 9000 series freehub fit?
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1Seems unlikely. An 11 speed R9000 freehub will be a little longer than a 10 speed.– Argenti ApparatusCommented Jul 28, 2019 at 17:44
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@Argenti, seems to make sense, but on bike.shimano.com/en-EU/product/component/duraace-9000/… it looks as if it can support 10 speed and 11 speed.– Robert BethgeCommented Jul 28, 2019 at 18:07
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1Do you want to replace just the freehub body, or the entire hub?– Argenti ApparatusCommented Jul 28, 2019 at 18:13
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Not sure....when I go downhill fast w/o pedaling, I get a high-pitched sound. I was told that the freewheel needs to be replaced.– Robert BethgeCommented Jul 28, 2019 at 18:22
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1Can you be more specific? I'm pretty sure you don't mean freewheel, because those are 5-7 speed systems where the ratcheting mechanism is contained together with the cogs. A freehub body looks like the link at the end. You can't simply mount any freehub body to any hub. We need to know what your rear hub is. content.competitivecyclist.com/images/items/900/DTS/DTS000G/…– Weiwen NgCommented Jul 28, 2019 at 20:02
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1 Answer
It is possible to replace a 10-speed freehub by a FH-9000 (11-speed) freehub and still be able to use the same CS-5700 (10-speed) cassette. Since a 10-speed cassette is narrower than an 11-speed one, two spacers need to be added between the freehub and the cassette. The following illustration from the FH-9000 Dealer's Manual on page 5 shows it:
If you meant to replace only the freehub body and not the whole freehub as mentioned by Weiwen Ng in the comment section, you would be very lucky that a Dura-Ace 9000 series freehub body fits on your hub. As an exemple, even the FH-7800 and FH-9000 freehub body, both from the same manufacturer, do not have the same shape and do not attach the same way to the hub.
FH-9000:
FH-7800:
Sheldon Brown has a great page about Shimano freehub body compatibility. Some models are interchangeable between hubs, some are not. The best way forward would just be to order the exact same freehub body that you have if it is the only part that is causing an issue.
answered Feb 11, 2023 at 20:04
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Just to clarify, you have shown that the OP could replace the hub. Some of the comments above are discussing that you can’t replace the freehub body of a 7800 hub with a 9000-series part. Unfortunately, we don’t know what the OP meant. Commented Feb 11, 2023 at 21:01
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@WeiwenNg you are right. My answer only addresses the original question which was about freehub compatibility. I'll edit my answer to also cover what you pointed out in the comment section about the freehub body compatibility. Commented Feb 11, 2023 at 21:25