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Shimano freehub: ok to remove spacer?

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Shimano freehub: ok to remove spacer?

Old 06-01-07, 09:44 PM
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keevohn
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Shimano freehub: ok to remove spacer?

I want to replace the stock freehub on my Shimano 105-SC 8 speed rear hub (FH-1056) with a 9 speed Ultegra freehub. Problem is, the interface between the freehub and the hub shell is different for both: whereas the rear of the stock freehub sits flush with the hub shell, the new freehub sits out 3 or 4mm, creating a gap. There is a spacer between the stock freehub and the hub shell that, when removed, allows the new freehub to sit a couple of millimeters closer to the hub shell.

My questions:
1) Assuming the cassette still clears the frame, is it a problem to leave the spacer in there and have a 3 to 4mm gap between the freehub and the hub shell? Will this allow more crap to get into the freehub internals and shorten its life?

2) Is there any problem in removing the spacer between the freehub and the hub shell? The only thing I can think is that it might be a buffer between the steel freehub body and the softer aluminum hub shell, but I don't know if that's an issue.

Thanks in advance. I can post pictures if necessary.
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Old 06-02-07, 06:14 AM
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Why do you want to replace an 8-speed freehub with a 9-speed freehub? They're the same/compatible. 7-speed freehub is narrower (b/c the 7-speed cassette is narrower) but 8 and 9-speed cassettes take up the same width on the freehub.
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Old 06-02-07, 08:48 AM
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I agree w/TC, the 8 and 9 speed are the same width, so why? I've done 1 transplant, but not exactly yours, and I didn't have any spacing issue. Does the freehub body need a specific orientation with the hub shell? I don't remember, but try twisting them slowly to see if it falls into place.
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Old 06-02-07, 04:12 PM
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Originally Posted by timcupery
Why do you want to replace an 8-speed freehub with a 9-speed freehub? They're the same/compatible. 7-speed freehub is narrower (b/c the 7-speed cassette is narrower) but 8 and 9-speed cassettes take up the same width on the freehub.
Tim is correct, the hub bodies are identical.

BTW, I've replaced 7-speed freehub bodies with 8/9-speed bodies and the transplant was painless.
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Old 06-02-07, 05:16 PM
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Does this possibly shed some light on the situation???
I don't know if it will, but I ran across it earlier today while researching a (garage sale) wheel with "wobbly" cogs (except the 11).
https://sheldonbrown.com/k7.html#hyperdrivec
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Old 06-03-07, 05:37 AM
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I realize that the 8 and 9 speed freehub bodies are the same width where the cassette mounts. The reason I asked my questions above are several:

1) I already have a 9 speed Ultegra freehub body and matching drive-side cone (with dust cap) that I purchased for its 11 tooth sprocket compatibility. I had assumed my 8 speed 105-SC freehub wouldn't be 11 tooth compatible, but turns out it is.

2) I'm trying to install a 10 speed 11-25 tooth Wheels Mfg. Accelerator cassette on my rear hub. For those that aren't familiar with it, this cassette allows full Campy 10 speed compatibility on Shimano freehubs, and comes with a set of spacers that are mounted between the 25 tooth sprocket and the rear of the freehub, allowing for fine-tuning of the cassette. With the stock 105-SC freehub, I can't mount the cassette to my satisfaction: either the 25 tooth sprocket is too close to the hub shell and the derailleur cage rubs the spokes on hard uphill efforts, or the 11 tooth sprocket just barely engages the freehub splines and I'm concerned that it'll disengage during a hard downhill sprint.

The fact that the Ultegra 9 speed freehub doesn't mount flush with the hub shell is a good thing: it gives me a little more adjustment room to get the cassette far enough away from the spokes to prevent rubbing and enough engagement on the 11 tooth sprocket for my peace of mind. However, I found yesterday that mounting the new freehub without the spacer (technically a washer) that goes between it and the hub shell introduces too much wobble in the cassette. With the washer installed it still wobbled too much for my liking, so I went back to the stock freehub. What I probably need is a non-Hyperdrive-C 8-speed era freehub, with its longer splines that extend all the way to the edge. This would give me the additional engagement on the 11 tooth sprocket that I need while allowing me to mount the 25 tooth sprocket far enough away from the spokes. Hopefully, it would also mount flush to the hub shell to eliminate wobble.

Hope this clears things up a bit. Thanks for the responses.
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