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Freehub body help (lemmy.world)
submitted 4 months ago by to c/bicycles@lemmy.ca
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Does anybody know what the name of this feature is?

This is the back side of a hyperglide hub where the hub body engages the wheel hub. I'm trying to upgrade to 10 speed. Original on the left, new part on the right. There's 10 teeth on the old one and 15 on the new one.

New one obviously won't fit due to the difference in the number of teeth, but adding 10 tooth to my searches doesn't bring up anything helpful

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[–] [S] 5 points 4 months ago* (4 children)

The only reason these aren't interchangeable is the difference in the number of teeth. I'm trying to figure out what that feature is called. I know one of the alternative styles is 3-prawl, but I was hoping that someone would know the name of this style specifically with 10 teeth.

The reason I'm upgrading the freehub body is to accommodate a wider 10s cassette since the current 7s hyperglide is only large enough for 9s.

Adding a photo of the wheel side since I can't edit main post:

1000004206

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  • [–] 1 point 4 months ago

    Those teeth are not involved in the ratcheting system. They are only how the freehub body attaches to the rest of the hub. The pawls are inside the freehub.

    One additional consideration you need to account for is the chain stay width. 7s and 10s are not the same. You can spread a steel frame to fit, but it isn’t easy.

    I tried to do what you want by disassembling the freehub body and keeping the base that fit my hubs, but it didn’t work. So I stopped at 9s.

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  • [–] 1 point 4 months ago* (last edited 4 months ago) (2 children)

    Would that not net a hub that is then wider in total, and no longer a size that fits the frame?

    AFAIK, the cassette mount is not the only thing that changes when going from one size to another.

    The new part looks wider, even if if you could install it, you wouldn't get something that works.

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  • [–] [S] 1 point 4 months ago (1 child)

    It's only a 4-5 mm difference, so it fits fine in the rear triangle with the stock axle even with the added 3mm from the new part not meshing correctly (10t vs 15t)

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  • [–] 1 point 4 months ago*

    Ok, but that still leaves the fact this isn't supposed to to work.

    You're combining parts even the manufacturer will never have considered would be used together.

    The internal ratcheting mechanism and how it is mounted isn't a standard you can look up compatible parts for the way cassetes or bottom brackets are.

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