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  1. #1
    Rider On The Storm
    Reputation: crimsontime's Avatar
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    Noise that only occurs at high speed, derailleur or freewheel?

    Hey guys,
    I'm trying to diagnose a noise that only starts to occur when I'm going high speed and not peddling at all. It's like a thrumming sound and it induces some minor vibration and it seems to come from the rear derailleur or freewheel. If I start peddling even slowly that mitigates the noise. Any ideas on what this is? I'm on a budget and want to do a DIY repair, but even if I took it to a shop this is hard to reproduce since it does not occur at all at low speed. What I'm worried is that this could cause the bike to lock up or something at speed if it gets worse.

    Also, I'm not sure if I'm in the right forum to post this, as I haven't posted much in the last decade.

  2. #2
    Nutrailer
    Reputation: JackWare's Avatar
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    Hi CT
    Can you provide more info regarding the bike? Brand and model, what components make up the drivetrain, types of brakes etc, it will help narrow down peoples views and suggestions to solve your problem.
    What a perfect waste of time

  3. #3
    Sneaker man
    Reputation: mik_git's Avatar
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    is it a mavic wheel?
    All the gear and no idea.

  4. #4
    Nutrailer
    Reputation: JackWare's Avatar
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    As you've posted in DT as well it may be worth deleting your post here to avoid chasing answers in both
    What a perfect waste of time

  5. #5
    Rider On The Storm
    Reputation: crimsontime's Avatar
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    It's a Cannondale Prophet 800, 2006 model, all stock components (Deore LX/ XT from way back then) and yes it has a Mavic rear wheel. The rear wheel isn't stock, I think I bought it used after the old one was damaged, but this had to have been at least 8 years ago. Memory is foggy. Just started riding a lot again recently.

  6. #6
    Sneaker man
    Reputation: mik_git's Avatar
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    Not saying it IS, but could be the mavic scream, I had this the other week on my road wheels, all of a sudden, at speed I get this...grinding, vibrating sort of howl. Turns out a well know issue, lack of lub in he freewheel, which leads to the bushing binding on the hub. Pulled it apart, put a little lube smeared about, problem when away. If it is left too long the bushing wears, so you have to replace it.
    Could be that, could be something else...
    All the gear and no idea.

  7. #7
    mtbr member
    Reputation: J.B. Weld's Avatar
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    Probably something in the freehub mechanism is making the noise.
    I brake for stinkbugs

  8. #8
    Rider On The Storm
    Reputation: crimsontime's Avatar
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    Thanks guys I will pull it apart tonight and add some lube... see if that fixes it. I'm adverse to spending too much money on this old steed, although it still is riding well otherwise.

  9. #9
    mtbr member
    Reputation: J.B. Weld's Avatar
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    Freehub.
    I brake for stinkbugs

  10. #10
    Beer Please! SuperModerator
    Reputation: Klurejr's Avatar
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    Sounds like a hub issue. Moved both threads to Wheels n Tires and merged them.
    Ride Bikes, Drink Craft Beer, Repeat.

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  11. #11
    Rider On The Storm
    Reputation: crimsontime's Avatar
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    Quote Originally Posted by mik_git View Post
    I get this...grinding, vibrating sort of howl. Turns out a well know issue, lack of lub in he freewheel, which leads to the bushing binding on the hub.
    Could be that, could be something else...
    That sounds like it exactly. We'll see. Thanks!

  12. #12
    mtbr member
    Reputation: Lone Rager's Avatar
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    Many Mavic freehubs use a big plastic bushing for the freehub bearing at the hub. Lubing it can help but they will wear to a point where the freehub becomes wobbly and should be replaced (~$50). For lube, I've used Slick Honey or Phil's Tenacious oil. IDK specifically what Mavic recommends.
    Do the math.

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