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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

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Old 07-01-14, 10:35 PM   #1
Watchdog
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Put new set of Askiums on my Cervelo RS

They definitely need some truing. There's a significant and easily observed wobble in the wheel. Would this cause the cassette to appear to move slightly from side to side as the wheel turns?

I'm hoping this is common and easily fixed once the wheel is trued. Has anyone else encountered this?
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Old 07-01-14, 10:38 PM   #2
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Originally Posted by Watchdog View Post
They definitely need some truing. There's a significant and easily observed wobble in the wheel. Would this cause the cassette to appear to move slightly from side to side as the wheel turns?

I'm hoping this is common and easily fixed once the wheel is trued. Has anyone else encountered this?
Sounds like the cassette is a little bent itself because the hub really remains unmoved during truing. What you are bending when truing are the rims themselves. This might be better answered in the mechanics section of the forum by the way. Unless the shifting is off after being properly adjusted, I would leave the cassette be.
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Old 07-02-14, 06:30 AM   #3
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I have a pair but why did you cheap out? What did you have before? A solid but Low grade wheels for a Cevelo?
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Old 07-02-14, 06:55 AM   #4
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Askiums?? Do they chatter a lot? "Are you done riding yet?" "When are we gonna be there?" (Get it? askiums).

Seriously, the slight waving you see in the cassette is fairly common (though not all exhibit this) and does not seem to affect performance in any way, and is therefore nothing to worry about, nor is it related to the trueness of the rim or wheel. It usually derives from a little play in the hub /cassette body interface.

You can watch the rim movement between the brake pads to see if the wheel is out of true.
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Old 07-02-14, 01:00 PM   #5
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If these wheels are brand new, this probably isn't the cause, but just for completeness: Mavic's FTS-X freehub system rides on an oil-bathed bushing rather than the more common bearing assembly, and if that bushing is not maintained and kept lubricated it can wear significantly, leading to loose fitting of the freehub body and therefore the cassette. You can tell very easily if this is the case with your wheel: grab the cassette and try to wobble it off the central axis of the wheel. If there's any significant amount of travel, you're probably going to want to at least have a look at that bushing; you may need a new freehub. Details on how to get into the freehub to have a look are here:

http://www.mavic.ca/sites/default/fi...oad/FTSX_0.pdf

The manual warns in scary terms to ONLY use the super-secret proprietary mineral oil that Mavic will sell you for a hojillion dollars per fluid ounce; I just use 10-weight fork oil, which has so far completely failed to disintegrate the hub, despite the warnings.

Even if this isn't the specific issue you're dealing with, it's important to know this quirk of your wheelset. I run Mavic wheels with FTS-X freehubs on both road and mountain, and I can recommend them without reservation - but you really do need to do the hub disassembly and bushing re-oiling at least once a season.
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Old 07-02-14, 01:08 PM   #6
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I would check to see if you might be missing a spacer.
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Old 07-04-14, 10:58 PM   #7
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I have a pair but why did you cheap out? What did you have before? A solid but Low grade wheels for a Cevelo?
Bike came with Shimano R500, which is a pretty low end wheel. I actually bought the Askiums a couple of years ago for a different bike but did not install them right away. Then Cervelo had their infamous sale and I bought the RS. I figured the Askiums were better than the R500s, and those will go on my commuter cross bike as the rims on that bike are concave and I think will need replacing after one more winter of commuting.
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Old 07-04-14, 11:02 PM   #8
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Thanks for the replies.

jralbert, thanks for the info I will keep that in mind.

I did install a spacer. I think I will get the wheel trued as it needs to be done anyway and then I will take the cassette off, and put it back on. Maybe the cassette needs to be tighter. I did not use a torque wrench so there is a possibility that I need to tighten more.
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