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Almost-random noise

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Cycling Equipment
Published
28 February 2008
Last activity
29 February 2008
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  1. I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming from
    the front end of the bike. The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    - It is not in any way related to pedalling frequency or force; I can
    coast or pull up on both pedals (SPD) and there is no effect.

    - It happens whether I'm sitting or standing.

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    - It is not the fenders; I can be coasting downhill, and muffle the
    fenders with a gloved hand, and there is no difference. (This
    surprised me; I suspected that the problem was the headset, and that
    the front fender was amplifying the sound.)

    - It cannot be reproduced on the workstand by rapping on things, or by
    sitting on the bike while stationary, or by lifting and dropping the
    front or rear end.

    I believe the only non-random thing about it is speed; it only seems
    to start happening once I get up to 10 miles per hour or so.

    I tightened the (threadless) headset. That ain't it. (I doubted
    this; if it was the headset, I should have been able to get the noise
    to occur in my garage). I replaced the QR skewers, based on something
    I read here on r.b.t that turned up in a search. That ain't it
    neither.

    The total randomness suggests it's an accessories rather than wheels/
    headset/etc., and the nature of the sound itself suggest the
    (alumin(i)um) fenders (the only accessory I have - no computer, no
    nothing), but as I said, muffling the fenders with my hand has no
    effect -- I'm not even sure I can feel the "tinks" coming through the
    fenders at all.

    My only remaining notion is that the headset or wheel bearings have
    developed rust. Any votes for this possibility?

    It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    appreciate your taking the time to read this.

    Chris

  2. Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    Quoted message said:

    My only remaining notion is that the headset or wheel bearings have
    developed rust. Any votes for this possibility?

    It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    appreciate your taking the time to read this.

    - Broken spoke, squeeze all pairs to see if you can find it, they
    sometimes break at the elbow and cannot be noticed at first glance.
    - Cracked chainring (I had this a while back and eventually found it
    when I replaced BB)

  3. Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...


    snip

    Quoted message said:

    It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    appreciate your taking the time to read this.

    You got spoke reflectors?
    Wheels true?
    Fender clearance good?
    Check for gnomes?

  4. landotter said:
    Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down.  It sounds like:

    Quoted message said:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...


    snip

    Quoted message said:

    It's a steel-framed bike with 36-spoke wheels.  I'm a big boy.  I
    appreciate your taking the time to read this.

    You got spoke reflectors?
    Wheels true?
    Fender clearance good?
    Check for gnomes?

    bash the saddle. hear if its sqwueeks

  5. landotter said:

    You got spoke reflectors?

    Yeah... I'm liking this. Last time I re-packed a hub, turned out it
    was a reflector.

    Quoted message said:

    Wheels true?

    Dead.

    Quoted message said:

    Fender clearance good?

    Ridiculously.

    Quoted message said:

    Check for gnomes?

    They're still hibernating.

  6. Quoted message said:
    landotter said:

    You got spoke reflectors?

    Yeah... I'm liking this. Last time I re-packed a hub, turned out it
    was a reflector.

    I've had them mess with my head a few times. They'll look fine, but be
    loose enough to catch air and "tink" against a spoke with each
    revolution.

  7. Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming from
    the front end of the bike. The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    - It is not in any way related to pedalling frequency or force; I can
    coast or pull up on both pedals (SPD) and there is no effect.

    - It happens whether I'm sitting or standing.

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    - It is not the fenders; I can be coasting downhill, and muffle the
    fenders with a gloved hand, and there is no difference. (This
    surprised me; I suspected that the problem was the headset, and that
    the front fender was amplifying the sound.)

    - It cannot be reproduced on the workstand by rapping on things, or by
    sitting on the bike while stationary, or by lifting and dropping the
    front or rear end.

    I believe the only non-random thing about it is speed; it only seems
    to start happening once I get up to 10 miles per hour or so.

    I tightened the (threadless) headset. That ain't it. (I doubted
    this; if it was the headset, I should have been able to get the noise
    to occur in my garage). I replaced the QR skewers, based on something
    I read here on r.b.t that turned up in a search. That ain't it
    neither.

    The total randomness suggests it's an accessories rather than wheels/
    headset/etc., and the nature of the sound itself suggest the
    (alumin(i)um) fenders (the only accessory I have - no computer, no
    nothing), but as I said, muffling the fenders with my hand has no
    effect -- I'm not even sure I can feel the "tinks" coming through the
    fenders at all.

    My only remaining notion is that the headset or wheel bearings have
    developed rust. Any votes for this possibility?

    It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    appreciate your taking the time to read this.

    Spin the front axle, without skewer, in your fingers. My own
    salt-encrusted front hub also has road scum in it and makes that noise.
    --
    Andrew Muzi
    www.yellowjersey.org
    Open every day since 1 April, 1971

  8. Quoted message said:
    landotter said:

    You got spoke reflectors?

    Yeah... I'm liking this. Last time I re-packed a hub, turned out it
    was a reflector.

    Quoted message said:

    Wheels true?

    Dead.

    Quoted message said:

    Fender clearance good?

    Ridiculously.

    Quoted message said:

    Check for gnomes?

    They're still hibernating.

    Swap your front wheel with another one. Is it gone?
    Lube the spoke nipple/rim interface.

    Lou

  9. Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming from
    the front end of the bike. The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    Have you checked the bottom bracket, a.k.a. "where fearful sounds usually dwell"?

  10. <[email hidden]> wrote in message
    news:[email hidden]...
    | I'm being driven slowly insane by a noise I have been unable to track
    | down. It sounds like:
    |
    | tink... tink TANK... ... ... TANKtink...
    | tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...
    |
    | It is almost completely random. It sounds very much like an
    | automobile cooling off after a long drive. It seems to be coming from
    | the front end of the bike. The louder TANKs can be felt through the
    | handlebars (yikes!) or occasionally through the cranks.
    |
    | - It is not in any way related to pedalling frequency or force; I can
    | coast or pull up on both pedals (SPD) and there is no effect.
    |
    | - It happens whether I'm sitting or standing.
    |
    | - It is not affected by my pulling/pushing/twisting the handlebars,
    | nor by riding no-hands.
    |
    | - It is not the fenders; I can be coasting downhill, and muffle the
    | fenders with a gloved hand, and there is no difference. (This
    | surprised me; I suspected that the problem was the headset, and that
    | the front fender was amplifying the sound.)
    |
    | - It cannot be reproduced on the workstand by rapping on things, or by
    | sitting on the bike while stationary, or by lifting and dropping the
    | front or rear end.
    |
    | I believe the only non-random thing about it is speed; it only seems
    | to start happening once I get up to 10 miles per hour or so.
    |
    | I tightened the (threadless) headset. That ain't it. (I doubted
    | this; if it was the headset, I should have been able to get the noise
    | to occur in my garage). I replaced the QR skewers, based on something
    | I read here on r.b.t that turned up in a search. That ain't it
    | neither.
    |
    | The total randomness suggests it's an accessories rather than wheels/
    | headset/etc., and the nature of the sound itself suggest the
    | (alumin(i)um) fenders (the only accessory I have - no computer, no
    | nothing), but as I said, muffling the fenders with my hand has no
    | effect -- I'm not even sure I can feel the "tinks" coming through the
    | fenders at all.
    |
    | My only remaining notion is that the headset or wheel bearings have
    | developed rust. Any votes for this possibility?
    |
    | It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    | appreciate your taking the time to read this.
    |
    |
    | Chris

    Its a long shot, but check your front rim - I had a double-walled MTB rim
    that had chunks of white chalky gunk in between the walls. Sometimes this
    chunks would make a plinking sound as they got tossed around inside the
    rim.

    Jean

  11. Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down.  It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    It is almost completely random.  It sounds very much like an
    automobile cooling off after a long drive.  It seems to be coming from
    the front end of the bike.  The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    - It is not in any way related to pedalling frequency or force; I can
    coast or pull up on both pedals (SPD) and there is no effect.

    - It happens whether I'm sitting or standing.

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    - It is not the fenders; I can be coasting downhill, and muffle the
    fenders with a gloved hand, and there is no difference.  (This
    surprised me; I suspected that the problem was the headset, and that
    the front fender was amplifying the sound.)

    - It cannot be reproduced on the workstand by rapping on things, or by
    sitting on the bike while stationary, or by lifting and dropping the
    front or rear end.

    I believe the only non-random thing about it is speed; it only seems
    to start happening once I get up to 10 miles per hour or so.

    I tightened the (threadless) headset.  That ain't it.  (I doubted
    this; if it was the headset, I should have been able to get the noise
    to occur in my garage).  I replaced the QR skewers, based on something
    I read here on r.b.t that turned up in a search.  That ain't it
    neither.

    The total randomness suggests it's an accessories rather than wheels/
    headset/etc.,  and the nature of the sound itself suggest the
    (alumin(i)um) fenders (the only accessory I have - no computer, no
    nothing), but as I said, muffling the fenders with my hand has no
    effect -- I'm not even sure I can feel the "tinks" coming through the
    fenders at all.

    My only remaining notion is that the headset or wheel bearings have
    developed rust.  Any votes for this possibility?

    It's a steel-framed bike with 36-spoke wheels.  I'm a big boy.  I
    appreciate your taking the time to read this.

    Chris

    A good practical joke is to remove the seatpost from a buddy's bike
    while they are not looking and toss a spoke down into the frame. Very
    hard to diagnose!

    I have had difficult to trace click/squeaks which turned out to be:

    1. The rear skewer lever grazing the seat-stay.

    2. The down-tube cable stops clicking when the steering wiggled the
    cables a bit while pedalling.

    3. A bottle-cage braze-on that had separated from the frame.

    Or it could be just some loose spokes.

    Joseph

  12. email hidden said:
    Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down.  It sounds like:

    Quoted message said:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    Quoted message said:

    It is almost completely random.  It sounds very much like an
    automobile cooling off after a long drive.  It seems to be coming from
    the front end of the bike.  The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    Quoted message said:

    - It is not in any way related to pedalling frequency or force; I can
    coast or pull up on both pedals (SPD) and there is no effect.

    Quoted message said:

    - It happens whether I'm sitting or standing.

    Quoted message said:

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    Quoted message said:

    - It is not the fenders; I can be coasting downhill, and muffle the
    fenders with a gloved hand, and there is no difference.  (This
    surprised me; I suspected that the problem was the headset, and that
    the front fender was amplifying the sound.)

    Quoted message said:

    - It cannot be reproduced on the workstand by rapping on things, or by
    sitting on the bike while stationary, or by lifting and dropping the
    front or rear end.

    Quoted message said:

    I believe the only non-random thing about it is speed; it only seems
    to start happening once I get up to 10 miles per hour or so.

    Quoted message said:

    I tightened the (threadless) headset.  That ain't it.  (I doubted
    this; if it was the headset, I should have been able to get the noise
    to occur in my garage).  I replaced the QR skewers, based on something
    I read here on r.b.t that turned up in a search.  That ain't it
    neither.

    Quoted message said:

    The total randomness suggests it's an accessories rather than wheels/
    headset/etc.,  and the nature of the sound itself suggest the
    (alumin(i)um) fenders (the only accessory I have - no computer, no
    nothing), but as I said, muffling the fenders with my hand has no
    effect -- I'm not even sure I can feel the "tinks" coming through the
    fenders at all.

    Quoted message said:

    My only remaining notion is that the headset or wheel bearings have
    developed rust.  Any votes for this possibility?

    Quoted message said:

    It's a steel-framed bike with 36-spoke wheels.  I'm a big boy.  I
    appreciate your taking the time to read this.

    Quoted message said:

    Chris

    A good practical joke is to remove the seatpost from a buddy's bike
    while they are not looking and toss a spoke down into the frame. Very
    hard to diagnose!

    I have had difficult to trace click/squeaks which turned out to be:

    1. The rear skewer lever grazing the seat-stay.

    2. The down-tube cable stops clicking when the steering wiggled the
    cables a bit while pedalling.

    3. A bottle-cage braze-on that had separated from the frame.

    Or it could be just some loose spokes.

    Joseph- Hide quoted text -

    - Show quoted text -

    most likely bearings are shot; either bb or hub. the tink tink tank
    sound is a bb being constantly pinched and shot out by it's
    neighbours. do the repack thing and you'll see I'm right

  13. In article
    <[email hidden]>,

    Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming from
    the front end of the bike. The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    - It is not in any way related to pedalling frequency or force; I can
    coast or pull up on both pedals (SPD) and there is no effect.

    - It happens whether I'm sitting or standing.

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    - It is not the fenders; I can be coasting downhill, and muffle the
    fenders with a gloved hand, and there is no difference. (This
    surprised me; I suspected that the problem was the headset, and that
    the front fender was amplifying the sound.)

    - It cannot be reproduced on the workstand by rapping on things, or by
    sitting on the bike while stationary, or by lifting and dropping the
    front or rear end.

    I believe the only non-random thing about it is speed; it only seems
    to start happening once I get up to 10 miles per hour or so.

    I tightened the (threadless) headset. That ain't it. (I doubted
    this; if it was the headset, I should have been able to get the noise
    to occur in my garage). I replaced the QR skewers, based on something
    I read here on r.b.t that turned up in a search. That ain't it
    neither.

    The total randomness suggests it's an accessories rather than wheels/
    headset/etc., and the nature of the sound itself suggest the
    (alumin(i)um) fenders (the only accessory I have - no computer, no
    nothing), but as I said, muffling the fenders with my hand has no
    effect -- I'm not even sure I can feel the "tinks" coming through the
    fenders at all.

    My only remaining notion is that the headset or wheel bearings have
    developed rust. Any votes for this possibility?

    It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    appreciate your taking the time to read this.

    Do not neglect the stem and bars. Should one of those
    components let go you will hurt.

    --
    Michael Press

  14. Chris Kay said:

    I'm being driven slowly insane by a noise I have been unable to
    track down. It sounds like:

    Quoted message said:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    Quoted message said:

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming
    from the front end of the bike. The louder TANKs can be felt
    through the handlebars (yikes!) or occasionally through the cranks.

    Quoted message said:

    - It is not in any way related to pedalling frequency or force; I
    can coast or pull up on both pedals (SPD) and there is no effect.

    Quoted message said:

    - It happens whether I'm sitting or standing.

    Quoted message said:

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    You must have missed the item on such noises recently when ball
    bearings were the subject. If water gets into the bearings, (usually
    front wheel) unless it got in from transporting the bicycle, exposed
    on the roof of a car, to a 70mph water spray. Then both wheels get
    wet.

    Open the bearing, wipe out the reddish past from the cones and races.
    Wipe the bearing balls in a clean cloth and don't worry that they are
    no longer silver. Put it all back together with 30W or heavier oil and
    be done with it.

    If these are "sealed" cartridge bearings, get new ones, an advantage of
    cartridge bearings. Random sharp clicking/snapping sounds come from
    bearings that got wet.

    The item:
    ======================================================================
    Subject: Re: An easy way to tell if your bearings are worn out.
    Date: Fri, 22 Feb 2008 04:50:14 -0000

    Aside from all the noise over worn bearings, let's be clear about
    this. The only types of wear that affect a bicycle ball bearing is
    rust and spalling.

    Rust in a wet ball bearing being ridden will dry out and leave fine
    rust that causes intermittent and random sharp cracking sounds. Such
    bearings can be cleaned by wiping traces of rust from the races and
    balls with a clean cloth before re-installing and oiling them. They
    will work fine.

    Bearings that have rusted at rest from water are another matter
    because that causes eroded rust grooves at the edge of the wet
    meniscus. The balls and probably their races are shot if this
    condition developed over a few days.

    The most common failing is spalling, in which the highly polished
    surface of bearing balls and even races, flake off much like a pot
    --
    Jobst Brandt

  15. On Thu, 28 Feb 2008 07:43:35 -0800 (PST), [email hidden] may

    have said:

    I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming from
    the front end of the bike. The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    - It is not in any way related to pedalling frequency or force; I can
    coast or pull up on both pedals (SPD) and there is no effect.

    - It happens whether I'm sitting or standing.

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    - It is not the fenders; I can be coasting downhill, and muffle the
    fenders with a gloved hand, and there is no difference. (This
    surprised me; I suspected that the problem was the headset, and that
    the front fender was amplifying the sound.)

    - It cannot be reproduced on the workstand by rapping on things, or by
    sitting on the bike while stationary, or by lifting and dropping the
    front or rear end.

    I believe the only non-random thing about it is speed; it only seems
    to start happening once I get up to 10 miles per hour or so.

    I tightened the (threadless) headset. That ain't it. (I doubted
    this; if it was the headset, I should have been able to get the noise
    to occur in my garage). I replaced the QR skewers, based on something
    I read here on r.b.t that turned up in a search. That ain't it
    neither.

    The total randomness suggests it's an accessories rather than wheels/
    headset/etc., and the nature of the sound itself suggest the
    (alumin(i)um) fenders (the only accessory I have - no computer, no
    nothing), but as I said, muffling the fenders with my hand has no
    effect -- I'm not even sure I can feel the "tinks" coming through the
    fenders at all.

    My only remaining notion is that the headset or wheel bearings have
    developed rust. Any votes for this possibility?

    It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    appreciate your taking the time to read this.

    Got a different seat post and seat assembly you can swap on for a
    while? I've seen seats do this, and been amazed at where the noises
    have seemed to be coming from.

    Also, check the rims, spoke hole by spoke hole, for cracks and
    under-tensioned spokes. Then check the welds on the head tube and the
    entire fork crown. (These last two are extremely long shots, but when
    you're chasing a creak, it pays to be meticulous and thorough.)

    --
    My email address is antispammed; pull WEEDS if replying via e-mail.
    Typoes are not a bug, they're a feature.
    Words processed in a facility that contains nuts.

  16. Quoted message said:
    Chris Kay said:

    I'm being driven slowly insane by a noise I have been unable to
    track down. It sounds like:

    Quoted message said:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    Quoted message said:

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming
    from the front end of the bike. The louder TANKs can be felt
    through the handlebars (yikes!) or occasionally through the cranks.

    Quoted message said:

    - It is not in any way related to pedalling frequency or force; I
    can coast or pull up on both pedals (SPD) and there is no effect.

    Quoted message said:

    - It happens whether I'm sitting or standing.

    Quoted message said:

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    You must have missed the item on such noises recently when ball
    bearings were the subject. If water gets into the bearings, (usually
    front wheel) unless it got in from transporting the bicycle, exposed
    on the roof of a car, to a 70mph water spray. Then both wheels get
    wet.

    Open the bearing, wipe out the reddish past from the cones and races.
    Wipe the bearing balls in a clean cloth and don't worry that they are
    no longer silver. Put it all back together with 30W or heavier oil and
    be done with it.

    If these are "sealed" cartridge bearings, get new ones, an advantage of
    cartridge bearings. Random sharp clicking/snapping sounds come from
    bearings that got wet.

    The item:
    ======================================================================
    Subject: Re: An easy way to tell if your bearings are worn out.
    Date: Fri, 22 Feb 2008 04:50:14 -0000

    Aside from all the noise over worn bearings, let's be clear about
    this. The only types of wear that affect a bicycle ball bearing is
    rust and spalling.

    Rust in a wet ball bearing being ridden will dry out and leave fine
    rust

    not with stainless bearings - that's why stainless bearings are both
    sold and used.

    Quoted message said:

    that causes intermittent and random sharp cracking sounds. Such
    bearings can be cleaned by wiping traces of rust from the races and
    balls with a clean cloth before re-installing and oiling them. They
    will work fine.

    Bearings that have rusted at rest from water are another matter
    because that causes eroded rust grooves at the edge of the wet
    meniscus. The balls and probably their races are shot if this
    condition developed over a few days.

    The most common failing is spalling, in which the highly polished
    surface of bearing balls and even races, flake off much like a pot

    http://www.tfot.info/news/1094/some-people-never-learn.html

  17. Quoted message said:

    I'm being driven slowly insane by a noise I have been unable to track
    down. It sounds like:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ... ... tink ... ... TANK ... ...

    It is almost completely random. It sounds very much like an
    automobile cooling off after a long drive. It seems to be coming from
    the front end of the bike. The louder TANKs can be felt through the
    handlebars (yikes!) or occasionally through the cranks.

    - It is not in any way related to pedalling frequency or force; I can
    coast or pull up on both pedals (SPD) and there is no effect.

    - It happens whether I'm sitting or standing.

    - It is not affected by my pulling/pushing/twisting the handlebars,
    nor by riding no-hands.

    - It is not the fenders; I can be coasting downhill, and muffle the
    fenders with a gloved hand, and there is no difference. (This
    surprised me; I suspected that the problem was the headset, and that
    the front fender was amplifying the sound.)

    - It cannot be reproduced on the workstand by rapping on things, or by
    sitting on the bike while stationary, or by lifting and dropping the
    front or rear end.

    I believe the only non-random thing about it is speed; it only seems
    to start happening once I get up to 10 miles per hour or so.

    I tightened the (threadless) headset. That ain't it. (I doubted
    this; if it was the headset, I should have been able to get the noise
    to occur in my garage). I replaced the QR skewers, based on something
    I read here on r.b.t that turned up in a search. That ain't it
    neither.

    The total randomness suggests it's an accessories rather than wheels/
    headset/etc., and the nature of the sound itself suggest the
    (alumin(i)um) fenders (the only accessory I have - no computer, no
    nothing), but as I said, muffling the fenders with my hand has no
    effect -- I'm not even sure I can feel the "tinks" coming through the
    fenders at all.

    My only remaining notion is that the headset or wheel bearings have
    developed rust. Any votes for this possibility?

    It's a steel-framed bike with 36-spoke wheels. I'm a big boy. I
    appreciate your taking the time to read this.

    Chris

    check the front wheel bearings. noise like this is often loose bearing
    balls "falling over the top" of the cone as they rotate. packed with
    fresh grease and correctly adjusted, they will run silent.

  18. jim beam said:

    not with stainless bearings - that's why stainless bearings are both
    sold and used.

    bs. take one apart and look at it. stainless does not mean corrision-
    proof; if you think so, do some research....like google!

  19. Quoted message said:

    tink... tink TANK... ... ... TANKtink...
    tink... ... ... ... ... ... ... ... ...
    ... tink ... ... TANK ... ...

    The prize goes to Messrs. Muzi, Brandt and Beam, with a nod to the
    fellow I ride home from work with, who was starting to complain about
    the noise himself. He suggested swapping in a different front wheel;
    this fixed everything and made my target clear. Starting simple, I
    greased the spoke crossings of the "bad" wheel to no effect. Spinning
    the wheel in a truing stand, I heard rumble; twisting the axle in my
    fingers, I felt it. I stripped, cleaned and reassembled the front hub
    with new bearings and lo, I am once again able to surprise raccoons.

    J. Brandt notes that I must have missed a recent topic. In fact, I
    had read that topic in my searches, although I somehow missed it
    during my daily morning coffee-and-rbt perusal. Perhaps one or two
    non-bicycle-technology-related threads pushed it off the front page.
    Hard to believe.

    And, that topic did place a seed in my mind (hence my "rusty wheel
    bearing" conjecture), but (A) I wasn't sure that the "cracking" sound
    it described was the same as my "tinking" sound, and (B) I'm still
    surprised that that sort of problem can cause that kind of sound, with
    a vibration so vigorous that I can feel it in the handlebars, pedals
    and (sometimes) my sprung leather saddle. Also (C), the wheel was
    bought new a couple years ago and couldn't have had 2,000 miles on
    it. (Accurate figures are not available because I had to remove the
    cyclocomputer for mental health reasons.) Oh, also, (D), as I
    alluded, so far, whenever I've had a weird noise, it's been hopelessly
    mundane. Only after I reinstall the headset do I notice the brake
    cable endcap tapping against the fender.

    Be all that as it may, I consider myself to have been significantly
    educated by these events, and humbly thank the group.

    (To those concerned with possible creeping handlebar/seatpost/frame
    damage, I can only thank you for your concern, and assure you that I
    am completely neurotic.)

  20. Quoted message said:
    jim beam said:


    not with stainless bearings - that's why stainless bearings are both
    sold and used.

    bs. take one apart and look at it. stainless does not mean corrision-
    proof; if you think so, do some research....like google!

    440c. look it up.

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