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9 Speed Cassette not Fitting

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9 Speed Cassette not Fitting

Old 05-07-14, 03:52 PM
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9 Speed Cassette not Fitting

I ordered a 9 speed cassette. The CSM91 from Sunrace, specifically. The wheelset I was putting it on came stock with an 8 speed cassette, at one point ran a 10 speed cassette without a spacer, just fine, but then, when I put a 9 speed cassette on, it was impossible to put the locking on and the 11 tooth cog would not bind with the splines.

All of the documents and answers I'm seeing say that 9 speed, even hyperglide c 9 speed, cassettes will always fit on 8 speed hubs if they are both Shimano. These are all modern parts, all modern standards, and the hubbody itself has the hyperglide-c compatible splines (where they cut off slightly early).

Any reason why they wouldn't fit?
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Old 05-07-14, 04:58 PM
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Have you compared the cassette width with a known Shimano 9 speed cassette? Some cassette have bolts or rivet's that keep the larger cogs assembled as one unit. The heads of these can protrude past the back side of the large cog and add "width" WRT the cassette's fit on the freehub body. Does your cassette have these ? Lastly there are reasons that some shops don't sell "off brand" parts. Andy.
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Old 05-07-14, 09:38 PM
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Originally Posted by Andrew R Stewart
Have you compared the cassette width with a known Shimano 9 speed cassette? Some cassette have bolts or rivet's that keep the larger cogs assembled as one unit. The heads of these can protrude past the back side of the large cog and add "width" WRT the cassette's fit on the freehub body. Does your cassette have these ? Lastly there are reasons that some shops don't sell "off brand" parts. Andy.
Just ran in to that on a Shimano HG-50 9 speed cassette and an RM-30 hub (8 speed but shouldn't matter).
I had to file the rivet heads flush and everything was fine.
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Old 05-08-14, 02:05 AM
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There are no rivet heads, there are no protrusions--the single bolt that holds everything together is recessed on both sides of the 7 cog cluster.

EDIT: Off-brand here is subjective, seeing as these are all made in the same factories with the same equipment, up to a point. The only thing that I think is coming to mind is that this cassette was shipped with the incorrect button two cogs--the ones made of solid metal. Taking an 8 speed spacer and fitting it between the cogs of the first 7--it won't fit--but then between the smallest two--slides right in.

Which yes, that is *very* annoying, but isn't a symptom of build quality as much as it is a packaging mistake. I'll go and find a normal 9 speed cassette to check on my hub and report back.
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