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Strange Buzzing from back wheel (Mavic Krysrium SSL)

drudru Posts: 1,341
edited November 2010 in Workshop
Hi people,

Went out yesterday on the winterbike and had a funny sound coming from back wheel.

A buzzing - this only happened when I was freewheeling and did not happen all the time.

A few other people commented on it - but did not know what it was.

The wheels in question were my Mavic Krysrium SSL's

Previously no issues with them, I had taken the freehub off last week to check the fitment of a shimano one, but then put the campag one back on and screwed in on. I then put the 9 speed campag cassette on (with all washers) and then the lockring.

For the start of the ride there was no problems/noise.

I also fitted the crud road racer mudguards as well, also gatorskins with a 25mm rear tyre.
The clearance is not so bad with the mudguards and tyres so I'm presuming that the noise is from the freehub.

Any ideas what it is and what I can do?




  • If you mean the Mavic Coasting Screech, then take the freehub off and clean, esp. the nylon bushing. Then apply light oil and reassemble. Watch that the pawls don't make a spring for freedom during the process. Google "mavic freehub screech" for more info...

    It's an easy job, about 5 mins.
  • drudru Posts: 1,341
    never heard about the screach.

    More of a buzzing that comes like the sound off blowing out your mouth in between two fingers and making a buzzing sound.

    I will however get the freehub off and check out what you say :)


  • I'dve said the Mavic Coasting Screech as well.

    I was half way through a 208km audax, descending off Buttertubs, when I got the dreaded screech. Meant I had to keep pedalling on all the downhills and the flat for approx 100km. Talk about knackering !!

    Like pinkbikini says, off with the freehub, give it a real good clean, apply a bit of light oil, care with pawls, put back on, job done, nice and quiet again !

    Good luck.
    "There are no hills, there is no wind, I feel no pain !"

    "A bad day on the bike is always better than a good day in the office !"
  • drudru Posts: 1,341
    A little update.

    I took the freehub apart the other night and cleaned it all out and regreased with some TF2 Teflon Grease and seemed to sort it all out (well at least strip clean and rebuild.

    However this morning went out on a club ride and after about 5 miles it was clear things were not working... i thought to start with that the chain had come off but infact the freehub had given up completly.

    No chance of a roadside repair so a long push back home.....

    ...stripped it to look at it and seems that the grease I had put in had jammed up the pawl springs, meaning they would not spring back out and grip the internal teeth.

    So - a second strip down and this time lubricate with oil.

    Seems to be working much better now and hope that I can give it a mid week run out prior to the start of my audax season which starts on Saturday.
  • DaSyDaSy Posts: 599
    The Mavic instructions say to use a light mineral oil on the rubber seal and the pawls, grease does tend to cause problems, as the pawl springs are pretty weak.
    Complicating matters since 1965
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