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Thread: Bikes: Crack on 1" Carbon Steerer

  1. #1
    Kenny
    Guest Kenny's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    Thinking that the creaking noise could be coming from my headset, I
    disassembled the stem from the fork and gave the headset barrings a
    shot of grease. In the process I decided to give my CF fork a careful
    inspection. At the top of the steerer where the stem clamps onto it
    there is a 12mm crack that runs north to south. The crack can be seen
    on the inside diameter of the steerer as well as on the outer surface.
    I suspect this crack is the result of over tightening of the stem. Is
    the structural integrity of the CF fork compromised? What are my
    options?

  2. #2
    Qui si parla Campagnolo
    Guest Qui si parla Campagnolo's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    > Thinking that the creaking noise could be coming from my headset, I
    > disassembled the stem from the fork and gave the headset barrings a
    > shot of grease. In the process I decided to give my CF fork a careful
    > inspection. At the top of the steerer where the stem clamps onto it
    > there is a 12mm crack that runs north to south. The crack can be seen
    > on the inside diameter of the steerer as well as on the outer surface.
    > I suspect this crack is the result of over tightening of the stem. Is
    > the structural integrity of the CF fork compromised?


    Certainly.

    What are my
    > options?


    Replacement is the only option.

  3. #3
    jim beam
    Guest jim beam's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    > Thinking that the creaking noise could be coming from my headset, I
    > disassembled the stem from the fork and gave the headset barrings a
    > shot of grease. In the process I decided to give my CF fork a careful
    > inspection. At the top of the steerer where the stem clamps onto it
    > there is a 12mm crack that runs north to south. The crack can be seen
    > on the inside diameter of the steerer as well as on the outer surface.
    > I suspect this crack is the result of over tightening of the stem. Is
    > the structural integrity of the CF fork compromised?


    yes!

    > What are my
    > options?


    stop using the fork immediately and buy a new one.

  4. #4
    Kenny
    Guest Kenny's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    Thanks for all the doom and gloom fellas. Am in the process of getting
    a new CF fork. Will definitely be using a torque wrench to install the
    sucker. So does anyone know what torque specifics I should use?

  5. #5
    Qui si parla Campagnolo
    Guest Qui si parla Campagnolo's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    > Thanks for all the doom and gloom fellas. Am in the process of getting
    > a new CF fork. Will definitely be using a torque wrench to install the
    > sucker. So does anyone know what torque specifics I should use?


    Ritchey has a really neat hand held clicking wrench, set to 5nm...what
    you need for just about any stem/carbon fork combo-about $20.

  6. #6
    Phil, Non-Squid
    Guest Phil, Non-Squid's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    > Thinking that the creaking noise could be coming from my headset, I
    > disassembled the stem from the fork and gave the headset barrings a
    > shot of grease. In the process I decided to give my CF fork a careful
    > inspection. At the top of the steerer where the stem clamps onto it
    > there is a 12mm crack that runs north to south. The crack can be seen
    > on the inside diameter of the steerer as well as on the outer surface.
    > I suspect this crack is the result of over tightening of the stem. Is
    > the structural integrity of the CF fork compromised? What are my
    > options?


    Hood ornament.

    Windchime.

    Truing stand.

    Destructive tests.

    Where's Bill when you need him?

    --
    Phil

  7. #7
    jim beam
    Guest jim beam's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    M-gineering wrote:
    > Lou Holtman wrote:
    > Use a torque wrench next time.
    >>
    >> Lou

    >
    > and a decent fitting plug, and leave the shaft a bit longer with a
    > spacer on top
    >

    i second that.

  8. #8
    Kenny
    Guest Kenny's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    > Yes. The collapse of the tube will propagate downward; when it gets
    > far enough, the stem will come loose, possibly suddenly and
    > completely.


    Confirmed. The crack is propagating itself downward. Damn!

    Kenny

  9. #9
    Qui si parla Campagnolo
    Guest Qui si parla Campagnolo's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    > On 27 Dec 2006 07:18:23 -0800, "Kenny" <Postoasted@..........> wrote:
    >
    > >Thinking that the creaking noise could be coming from my headset, I
    > >disassembled the stem from the fork and gave the headset barrings a
    > >shot of grease. In the process I decided to give my CF fork a careful
    > >inspection. At the top of the steerer where the stem clamps onto it
    > >there is a 12mm crack that runs north to south. The crack can be seen
    > >on the inside diameter of the steerer as well as on the outer surface.
    > >I suspect this crack is the result of over tightening of the stem. Is
    > >the structural integrity of the CF fork compromised?

    >
    > Yes. The collapse of the tube will propagate downward; when it gets
    > far enough, the stem will come loose, possibly suddenly and
    > completely.
    >
    > >What are my options?

    >
    > Replace the fork. Might I recommend using one with a steel or
    > aluminum steerer this time?
    > --

    Horrors! and add that few ounces? You must be kidding! What will
    those lizards at the coffee shop say when ya tell them!

  10. #10
    Michael Press
    Guest Michael Press's Avatar

    Default Bikes: Crack on 1" Carbon Steerer

    In article
    <1167232703.807455.25740@42g2000cwt..............c om>,
    "Kenny" <Postoasted@..........> wrote:

    > Thinking that the creaking noise could be coming from my headset, I
    > disassembled the stem from the fork and gave the headset barrings a
    > shot of grease. In the process I decided to give my CF fork a careful
    > inspection. At the top of the steerer where the stem clamps onto it
    > there is a 12mm crack that runs north to south. The crack can be seen
    > on the inside diameter of the steerer as well as on the outer surface.
    > I suspect this crack is the result of over tightening of the stem. Is
    > the structural integrity of the CF fork compromised? What are my
    > options?


    Steel fork and steering tube.

    --
    Michael Press

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