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Mavic Aksium cassette fitting woes

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Mavic Aksium cassette fitting woes

Old 05-18-13, 05:17 PM
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hazzak
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Mavic Aksium cassette fitting woes

I bought a lightly used pair of Mavic Aksium wheels and they came fitted with a 10 speed shimano cassette. My bike is running 9 speed so I want to move the cassette over from my old wheelset. So after some googling I've found that to run a 10 speed setup on the Aksium I need a 1mm shimano spacer plus a 1.75mm Mavic spacer. However when I took the 10 speed cassette off it actually had a single spacer that was 2.45mm. I then bought a 1.75mm Mavic spacer off the web thinking that was what I needed to fit my 9 speed cassette but after putting it all together there is still play in the cassette and the lockring won't tighten. I don't have any other spacers to hand but I tried the 2.45mm one that was on the 10 speed setup and it was too thick. Any idea what I'm supposed to do?

TL/DR version: Why doesn't the 1.75mm Mavic (M40417) plus 9 speed Shimano HG cassette fit on my Mavic wheels with a M10 freehub body?

Thanks!
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Old 05-18-13, 05:44 PM
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Jed19
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Did you try without any spacer? Try just putting your 9-Speed cassette on the freehub without the Mavic spacer, then tighten the lockring and see what obtains.
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Old 05-18-13, 06:01 PM
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That just makes it even worse as the lockring doesn't come anywhere near engaging with the smallest sprocket. What is also confusing is that I would have expected the 10 speed cassette to have only fit with a shimano spacer and a mavic spacer as per the mavic instructions (1mm+1.75mm = 2.75mm) but it actually works with only a 2.45mm spacer. So perhaps I have a odd cassette or weird freehub body?
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Old 05-18-13, 06:03 PM
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I've also tried using the 2.45mm spacer that worked with the 10 speed on the 9 speed and it's very slightly too thick and the last sprocket doesn't fit particularly well on the freehub body splines so perhaps what I need is a spacer that is around thicker than 1.75mm and thinner than 2.45mm.
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Old 05-18-13, 06:05 PM
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forget the so called rules and do it with an understanding of the objective.

All freehub/cassette systems require that the outer sprocket overhang the freehub by about 1mm (there's some wiggle room here so no great precision is involved). The overhang assures that the tightened lockring bears on and compresses the cassette without bottoming out on the face of the freehub.

In this way, it's analogous to how the stem/spacer stack has to be higher than the steerer on a threadless headset.

So knowing what's needed, use whatever combination of spacers behind the cassette to achieve it, regardless of the number of speeds, or brand of the parts involved.
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Old 05-18-13, 06:26 PM
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I bought the same wheel from REI last year. There was one shim taped to the hub.
I installed my cheap SRAM 9 speed cassette w/out the shim, tightened the cassette to
the spec'ed 40 nm using a torque wrench. There was play, so I repeated the whole
process but used the shim(don't know the dimension) next time. Turned out ok, I've
got a few thousand miles on it now. Even on the pot hole riddled streets of New York
city, no problems so far. Are you using a torque wrench? If not what you may think is
tight enough may not be and it would make the cassette seem loose/wobbly.
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Old 05-19-13, 07:49 AM
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Ran into this problem last year. I used an o-ring to take up the space until I could find the proper spacer. Looked all over the net and saw so many combinations. Finally found a friend with a few different spacers and got the right one.

Be nice to have a few spacers shipped with wheelset.
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