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Need to replace the cassette body on my Ksyrium SL wheel. Is there a tech sheet on this procedure?

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You need two tools: a cassette wrench or socket (it's a splined socket that fits into the cassette through the axle)and a chain whip wrench. You use the chain whip by wrapping it around one of the cogs of the cassette to immobilize it and then loosen the lock nut of the cassette with the cassette wrench. It is just like a screw or bolt. The Cassette needs to be lined up with the splines on the freehub. Find the thin spline and use it as your "key" because it is the only one that width. Then drop the new cassette on to the freehub and re-torque the cassette's lock ring. If the cassette is disassembled rather than one piece, from the largest cog first on the bottom, alternate between cogs and spacers until you are out of spacers. The smallest cogs have these cast in. As you take the old one off, the installation technique is the same in reverse.


Posted on Sep 15, 2009


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Broke spoke on mavic kyserium sl can't ride bike, miles from home

being a french bike I don't know who can get you a replacement , but if its just a spoke or two,, wind the broken ones around so they don't rub on the fork or frame, and I'll keep looking , so check back, wow those are expensive,, heres a link Is it the front or rear ? heres a rebuilt one for less

Jul 15, 2011 | Mavic Cycling

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I have 2006 mavic Ksyrium elite wheels having done less than 500 miles. The rear cassette is certainly tight enough but i can rock the cassette by about 1-1.5mm by holding the 25 ring? We've opened it all...

Could be the sealed bearings, just like a car, nothing gets better by itself if it is loose. With expensive wheels, take it to a shop unless you know what you are doing and have the proper tools. Why mess it up so that no one can fix it? Yes, I own 4 large bike stores and sell over 5000 bikes a year, anywhere from $325. to $12,000 models, so I do speak from experience. People are always amazed that the bike sometimes needs a tune up, Well, your car needs it too, but somehow a sewing machine or a bike shouldn't have to? Hummmm, interesting.
Take it to your dealer and let him advise you, this is not a do it yourselfer. Don't be surprised if you need a new chain, they stretch.

Sep 14, 2010 | Mavic Ksyrium Elite Wheelset

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Wheel does not stay true

Check if your spoke are tight enought, sometimes if the spokes are loosen the wheels will bent really easy.

May 18, 2010 | Mavic Ksyrium Elite Wheelset

1 Answer

Cant put my mavic back together properly

It sounds like you lost the washer that sits between the bearing in the nose and the freehub bearing. If you lose that washer, when you re-tighten the axle, the two bearings will bind and prevent the freewheel from spinning easily.

Take your freehub off again and see if that washer is there. If it isn't, you'll have to get a new one and replace it. It's easy to lose that thing if you don't know it's there when you take the wheel apart, because it'll just fall out.

When I reassemble those wheels. I thread the drive-side axle through the freehub body, then place the washer over the axle on the inside of the bearing, then thread the axle through the nose.

Also note that if your freehub seemed loose, it probably needs to be replaced. The FTS-L freehub body used on the Ksyrium wheels uses a nylon bushing as the friction interface to the nose, and this bushing wears down over time even with good lubrication.

Feb 10, 2010 | Mavic Ksyrium Elite Wheelset

1 Answer


In my experience with Shimano cassettes on Mavic wheels, the answer is "yes" but i had a mountain wheel and cassette. The only way to know is to put it on and see if there is slop in the fitment. If there is, then you have your answer. i also had this problem with Mavic: i had to adjust the high and low settings on my rear derailleur because of the awkward spacing of the Mavic freehub. Just something you should be aware of in case you have difficulty with shifting after the install. By the way - although they are inferior cassettes, SRAM cassettes seem to fit Mavic freehubs better.


Sep 14, 2009 | Cannondale Cycling

1 Answer

Noisy Rear Mavic Ksyrium Hub

Sounds like a road wheel with a worn FTS-L freehub body. You'll need to have it replaced.

What happens is that the nylon bushing wears, causing there to be play between the freehub and the nose of the wheel. Once there is enough play, the freehub can actually vibrate against the nose, causing noise and friction - which is why you see the chain slacken. This is commonly called the "squeal of death," meaning it is an indication that the freehub body is "dead."

A new FTS-L freehub body should be about $50-60 and shop shouldn't charge more than about $20 to change it out. Just be sure to tell the shop one very important thing:

"Do not lose the metal washer that sits on the axle between the outer bearing of the freehub body and the outer bearing of the nose of the wheel!"

This is so incredibly important - but time and time again, shop mechanics will lose this washer before they reassemble the wheel, causing a series of nightmares with the wheel.

Jun 09, 2009 | Mavic Ksyrium Elite Wheelset

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