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No high speed wobble

  • 12-02-2010 12:02am
    #1
    Muckers
    Registered Users, Registered Users 2 Posts: 504 ✭✭✭


    Ive just moved on from an aluminium frame to full carbon and realise that it takes a bit of getting used to.However at the start of the Barrow Wheelers sportive recently i experienced a wobble on the bike while descending at no more than 40kph. The road surface was quite lumpy and it didnt happen again until last weekend again at the start of a descent. On both occasions the bars wobbled badly and i had no option but to slow down.

    Any ideas as to the cause,or is it normal on a carbon frame. I checked that the wheels are tightened properly with the quick release and theres no problem on that score.

    Would appreciate any opinions from you boardsies.


Comments

  • #2
    [Deleted User]
    Posts: 1,427 ✭✭✭ [Deleted User]


    Sounds like speed wobble. Although it may seem counter intuitive, relax your grip on the bars, or try pressing your knees against the top tube. What frame is it btw?


  • #3
    Lumen
    Registered Users, Registered Users 2 Posts: 31,223 ✭✭✭✭Lumen


    Jobst Brandt on wobble.


  • #4
    Bikerbhoy
    Registered Users, Registered Users 2 Posts: 1,093 ✭✭✭Bikerbhoy


    Mmmmmm....... Gyroscopic Force ;)


  • #5
    Murph100
    Registered Users, Registered Users 2 Posts: 1,088 ✭✭✭Murph100


    Lots more info here :

    http://www.boards.ie/vbulletin/showthread.php?t=2055768507


  • #6
    07Lapierre
    Registered Users, Registered Users 2 Posts: 8,313 ✭✭✭07Lapierre


    Muckers wrote: »
    Ive just moved on from an aluminium frame to full carbon and realise that it takes a bit of getting used to.However at the start of the Barrow Wheelers sportive recently i experienced a wobble on the bike while descending at no more than 40kph. The road surface was quite lumpy and it didnt happen again until last weekend again at the start of a descent. On both occasions the bars wobbled badly and i had no option but to slow down.

    Any ideas as to the cause,or is it normal on a carbon frame. I checked that the wheels are tightened properly with the quick release and theres no problem on that score.

    Would appreciate any opinions from you boardsies.

    Loose headset? If the headset is even slightly loose, it can cause this.


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  • #7
    DirkVoodoo
    Registered Users, Registered Users 2 Posts: 11,505 ✭✭✭✭DirkVoodoo


    07Lapierre wrote: »
    Loose headset? If the headset is even slightly loose, it can cause this.

    Yup, it's a slightly terrifying experience. The only way to get out of it (as you may have read above) is to do the exact opposite to what your instincts tell you to do in a panic situation.


  • #8
    Muckers
    Registered Users, Registered Users 2 Posts: 504 ✭✭✭Muckers


    Its a Kuota Kharma frame.Thanks for all your replies as usual .Looks like i will just have to live with it.


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