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Stem recall



 
 
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  #1  
Old May 18th 17, 07:36 PM posted to rec.bicycles.tech
AMuzi
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Posts: 8,767
Default Stem recall

https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

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  #2  
Old May 18th 17, 11:06 PM posted to rec.bicycles.tech
[email protected]
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Posts: 2,882
Default Stem recall

On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Profile is one of the best stems I've used. Corrode and fail?
  #3  
Old May 18th 17, 11:49 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 8,767
Default Stem recall

On 5/18/2017 5:06 PM, wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.


Profile is one of the best stems I've used. Corrode and fail?


In that this particular model is carbon-wrapped aluminum, I
suppose that's a galvanic corrosion effect.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #4  
Old May 19th 17, 12:34 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 8,470
Default Stem recall

On Thursday, May 18, 2017 at 11:49:16 PM UTC+1, AMuzi wrote:
On 5/18/2017 5:06 PM, [email protected] wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.


Profile is one of the best stems I've used. Corrode and fail?


In that this particular model is carbon-wrapped aluminum, I
suppose that's a galvanic corrosion effect.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Maybe. But galvanic between what and what? Surely carbon is inert. I think it more likely that there was inadequate adhesion, air got in, a further layer of aluminum's self-defense layer was formed, furthering delimitation, and presto, a failure. One. One failure doesn't get my heart rate up much.

Andre Jute
Uncertainty proliferates
  #5  
Old May 19th 17, 01:08 AM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 8,767
Default Stem recall

On 5/18/2017 6:34 PM, Andre Jute wrote:
On Thursday, May 18, 2017 at 11:49:16 PM UTC+1, AMuzi wrote:
On 5/18/2017 5:06 PM, [email protected] wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.


Profile is one of the best stems I've used. Corrode and fail?


In that this particular model is carbon-wrapped aluminum, I
suppose that's a galvanic corrosion effect.


Maybe. But galvanic between what and what? Surely carbon is inert. I think it more likely that there was inadequate adhesion, air got in, a further layer of aluminum's self-defense layer was formed, furthering delimitation, and presto, a failure. One. One failure doesn't get my heart rate up much.

Andre Jute
Uncertainty proliferates


Right, a single incident for an oem product spanning several
years and several bicycle models would seem small, even
niggling to those of us not among the plaintiff's bar.

https://www.corrosionpedia.com/2/155...orced-polymers


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #6  
Old May 19th 17, 01:28 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 8,470
Default Stem recall

On Friday, May 19, 2017 at 1:08:52 AM UTC+1, AMuzi wrote:
On 5/18/2017 6:34 PM, Andre Jute wrote:
On Thursday, May 18, 2017 at 11:49:16 PM UTC+1, AMuzi wrote:
On 5/18/2017 5:06 PM, [email protected] wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.

Profile is one of the best stems I've used. Corrode and fail?

In that this particular model is carbon-wrapped aluminum, I
suppose that's a galvanic corrosion effect.


Maybe. But galvanic between what and what? Surely carbon is inert. I think it more likely that there was inadequate adhesion, air got in, a further layer of aluminum's self-defense layer was formed, furthering delimitation, and presto, a failure. One. One failure doesn't get my heart rate up much.

Andre Jute
Uncertainty proliferates


Right, a single incident for an oem product spanning several
years and several bicycle models would seem small, even
niggling to those of us not among the plaintiff's bar.

https://www.corrosionpedia.com/2/155...orced-polymers


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Thanks, Andrew. "The carbon fibers are electrically conductive and electrochemically very noble." Of course. Everything follows.

I was assuming intelligent specification and high-quality execution. (And, with only one failure, quality design and manufacture may indeed have been present.)

I don't have a lot of carbon fiber experience, but my understanding, from glass fiber (which I avoided when I could back in the day, for instance preferring instead to design my 68ft City of Germiston in molded wood, a proven-superb decision) practice is that the only good mixed matrix is made by totally enclosing the glass in the resin, leaving zero touchy-feely interface surfaces, for instance by anodizing ali to be locked into fiberglass as local reinforcing.

AJ
Electricity is weird, and less well understood than we pretend
  #7  
Old May 19th 17, 04:58 AM posted to rec.bicycles.tech
John B.[_3_]
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Posts: 3,157
Default Stem recall

On Thu, 18 May 2017 17:49:03 -0500, AMuzi wrote:

On 5/18/2017 5:06 PM, wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.


Profile is one of the best stems I've used. Corrode and fail?


In that this particular model is carbon-wrapped aluminum, I
suppose that's a galvanic corrosion effect.


I've read a number of articles about "fiberglass" and aluminum which
advised against fiberglass/aluminum joins. The articles stated that
corrosion could creep between the aluminum and the epoxy bond. I
suspect that in the case of CF composites what was reported to as
simply "corrosion" was actually a galvanic corrosion.

It might be noted that this phenomena has been reported since the
1960's.

--
Cheers,

John B.

  #8  
Old May 19th 17, 02:32 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 2,882
Default Stem recall

On Thursday, May 18, 2017 at 3:49:16 PM UTC-7, AMuzi wrote:
On 5/18/2017 5:06 PM, wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.


Profile is one of the best stems I've used. Corrode and fail?


In that this particular model is carbon-wrapped aluminum, I
suppose that's a galvanic corrosion effect.


Ahh, mixed metals.
  #9  
Old May 19th 17, 02:34 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 2,882
Default Stem recall

On Thursday, May 18, 2017 at 4:35:02 PM UTC-7, Andre Jute wrote:
On Thursday, May 18, 2017 at 11:49:16 PM UTC+1, AMuzi wrote:
On 5/18/2017 5:06 PM, [email protected] wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.


Profile is one of the best stems I've used. Corrode and fail?


In that this particular model is carbon-wrapped aluminum, I
suppose that's a galvanic corrosion effect.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Maybe. But galvanic between what and what? Surely carbon is inert. I think it more likely that there was inadequate adhesion, air got in, a further layer of aluminum's self-defense layer was formed, furthering delimitation, and presto, a failure. One. One failure doesn't get my heart rate up much.


Carbon is a conductor. And it isn't inert. Remember when resistors used to be made from carbon?
  #10  
Old May 19th 17, 07:23 PM posted to rec.bicycles.tech
Doug Landau
external usenet poster
 
Posts: 1,219
Default Stem recall

On Thursday, May 18, 2017 at 3:06:13 PM UTC-7, wrote:
On Thursday, May 18, 2017 at 11:36:53 AM UTC-7, AMuzi wrote:
https://drive.google.com/file/d/0B0Z...o1M3Q4Y3M/view

Produced 2007~2013. The interesting line is "may corrode and
fail". Not the usual, "may crack and fail". CPSC reports
exactly one incident with injury.
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Profile is one of the best stems I've used. Corrode and fail?


One stem is better than another, failures aside?
 




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