26
Freehub body help (lemmy.nz)
submitted 2 months ago* (last edited 2 months ago) by Cort@lemmy.world to c/bicycles@lemmy.ca
15 comments fedilink hide all child comments

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

top 15 comments
sorted by: hot top new old
[-] MentalEdge@sopuli.xyz 4 points 2 months ago* (last edited 2 months ago)

These parts are not interchangeable.

I'm not aware of any hubs where you can just swap out the cassette ratchet to upgrade the gearcount.

Cassettes that are the same width fit the same hubs, even when the gearcount differs.

To fit a larger (wider) cassette you'd need to replace the whole hub, no? That involves undoing the spokes, and relacing the wheel.

[-] Cort@lemmy.world 5 points 2 months ago

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.

[-] MentalEdge@sopuli.xyz 1 points 2 months ago* (last edited 2 months ago)

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.

[-] Cort@lemmy.world 1 points 2 months ago

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)

[-] MentalEdge@sopuli.xyz 1 points 2 months ago* (last edited 2 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.

[-] thenextguy@lemmy.world 1 points 2 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.

[-] avidamoeba@lemmy.ca 3 points 2 months ago

That's interesting. I didn't know they're different. Would've assumed they're the same.

[-] Cort@lemmy.world 2 points 2 months ago

Lol that's makes two of us.

[-] lol_idk@piefed.social 3 points 2 months ago* (last edited 2 months ago)

I’ve been working on bikes since the 80s and have never seen one like the 10 tooth thing. But it looks like an early version of the DT Swiss ratchet hub system, but really just a way to attach basically a freewheel vs freehub without screws vs the replaceable double “star ratchets”. I honestly don’t think you’re going to find anything that converts that to what you want without just replacing the hub

[-] hallettj@leminal.space 2 points 2 months ago

More brands are using ratchet hubs now that the patent has expired. Shimano calls their version "direct engagement".

There are some details in this article, and an animation of Shimano's version in this youtube animation

From the animation it looks like what DT Swiss called "star ratchets" Shimano calls "hub ratchet" and "outer ratchet".

I think it's still a freehub because the ratchet mechanism is at the freehub-wheel hub interface. A freewheel has the ratchet mechanism enclosed within its own body, right? With a static threaded interface to the wheel hub.

I'm still trying to understand how the spline OP is trying to identify fits in. Are we looking at the back of the mated ratchet rings?

[-] Cort@lemmy.world 2 points 2 months ago

So Shimano calls it a freewheel, and the ratchet mechanism is internal. The spline is what transmits force from the cassette to the rest of the hub/wheel, and/or what allows to wheel to spin the ratchet inside the freewheel with not pedaling.

Shimano Fh-c201 was the part I needed.

[-] lol_idk@piefed.social 1 points 2 months ago

Edited to say freewheel. Isn’t that just a freewheel and not a freehub body?

[-] Cort@lemmy.world 1 points 2 months ago

No it's a freehub body, hyperglide. Freewheel threads on, and this has a freehub fixing bolt to lock it down.

captured_image6281954590952671109

[-] simbico@lemmy.zip 1 points 2 months ago

I'd reach out to the hub manufacturer for more info.

[-] Cort@lemmy.world 1 points 2 months ago

Never found what the feature/interface portion is called but I did find the correct part that fit for 8/9/10s, it's the FH-c201

Works flawlessly

this post was submitted on 27 Jun 2026
26 points (100.0% liked)

Bicycles

6354 readers
1 users here now

Welcome to !bicycles@lemmy.ca

A place to share our love of all things with two wheels and pedals. This is an inclusive, non-judgemental community. All types of cyclists are accepted here; whether you're a commuter, a roadie, a MTB enthusiast, a fixie freak, a crusty xbiking hoarder, in the middle of an epic across-the-world bicycle tour, or any other type of cyclist!

Community Rules

Other cycling-related communities

founded 3 years ago
MODERATORS
Evkob@lemmy.ca