Interesting track crashes
 

An interesting video of track bicycles crashing. Amazing what happens when a tubular tire comes off the rim. I was surprised at how long one rider stayed up - he was okay until the front tire went under his rear wheel.

I saw bits flying around in some of the crashes but couldn't make out what those bits were.

https://www.youtube.com/watch?v=tf17hFikqrQ

Cheers

Interesting track crashes
 

On Thursday, November 29, 2018 at 1:25:28 PM UTC-8, Sir Ridesalot wrote:
An interesting video of track bicycles crashing. Amazing what happens when a tubular tire comes off the rim. I was surprised at how long one rider stayed up - he was okay until the front tire went under his rear wheel.

I saw bits flying around in some of the crashes but couldn't make out what those bits were.

https://www.youtube.com/watch?v=tf17hFikqrQ

Cheers

Track tubulars are paper thin so flats from overheating aren't all that uncommon. My friend who has turned into a total anti-carbon fiber nut sent me a video link to a subject he called "carbon fiber rim exploding under track rider." That isn't what I would have called it. If you look at it closely it looks like a track tandem gets a flat in the final sprint which throws the entire weight of the team unto the front disk which slowly comes apart as the tire peels off.

I showed him that foregoing manufacturing errors that all of the bicycle materials have approximately the same loaded lifespan. That was sort of surprising to me since I have a lot of steel bikes and never had a failure. But I suppose I usually buy them with very little use and they simply don't have that many miles.

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Interesting track crashes
 

On Wed, 26 Dec 2018 12:02:58 -0800 (PST), wrote:

On Thursday, November 29, 2018 at 1:25:28 PM UTC-8, Sir Ridesalot wrote:
An interesting video of track bicycles crashing. Amazing what happens when a tubular tire comes off the rim. I was surprised at how long one rider stayed up - he was okay until the front tire went under his rear wheel.

I saw bits flying around in some of the crashes but couldn't make out what those bits were.

https://www.youtube.com/watch?v=tf17hFikqrQ

Cheers

Track tubulars are paper thin so flats from overheating aren't all that uncommon. My friend who has turned into a total anti-carbon fiber nut sent me a video link to a subject he called "carbon fiber rim exploding under track rider." That isn't what I would have called it. If you look at it closely it looks like a track tandem gets a flat in the final sprint which throws the entire weight of the team unto the front disk which slowly comes apart as the tire peels off.

I showed him that foregoing manufacturing errors that all of the bicycle materials have approximately the same loaded lifespan. That was sort of surprising to me since I have a lot of steel bikes and never had a failure. But I suppose I usually buy them with very little use and they simply don't have that many miles.

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Interesting.
Of course Sheldon Brown, that sneaky devil, describes a study
conducted by EFBe (Engineering for Bikes) which is now, I believe, one
of the main elements of the DIN 79100 bicycle-testing standard, which
was published in TOUR magazine of Oct 1997 ( more then 20 years ago)
that demonstrated that two of the three frames that completed the test
with no failures were welded aluminum frames. Two out of three... lets
see, that is about 66.666 %, isn't it?

The Christian Bible has a phrase that seems to apply here (Proverbs
17:28. New International Version)

"Even a fool is thought wise if he keeps silent, and discerning if he
holds his tongue."

cheers,

John B.

Interesting track crashes
 

On 12/26/2018 3:02 PM, wrote:

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Damn. Mine's 32 years old. I'll have to travel back to 1996 and get rid
of it.

But then I won't be able to ride it across the U.S. in 2003. What to do??

--
- Frank Krygowski

Interesting track crashes
 

On Wed, 26 Dec 2018 20:59:24 -0500, Frank Krygowski
wrote:

On 12/26/2018 3:02 PM, wrote:

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Damn. Mine's 32 years old. I'll have to travel back to 1996 and get rid
of it.

But then I won't be able to ride it across the U.S. in 2003. What to do??

If you had a penny-farthing you could ride clear across the U.S. with
Thomas Stevens in 1884 :-)

Ain't bicycles wondrous :-)

cheers,

John B.

Interesting track crashes
 

On 27/12/18 11:22 am, John B. Slocomb wrote:
On Wed, 26 Dec 2018 12:02:58 -0800 (PST), wrote:

On Thursday, November 29, 2018 at 1:25:28 PM UTC-8, Sir Ridesalot wrote:
An interesting video of track bicycles crashing. Amazing what happens when a tubular tire comes off the rim. I was surprised at how long one rider stayed up - he was okay until the front tire went under his rear wheel.

I saw bits flying around in some of the crashes but couldn't make out what those bits were.

https://www.youtube.com/watch?v=tf17hFikqrQ

Cheers

Track tubulars are paper thin so flats from overheating aren't all that uncommon. My friend who has turned into a total anti-carbon fiber nut sent me a video link to a subject he called "carbon fiber rim exploding under track rider." That isn't what I would have called it. If you look at it closely it looks like a track tandem gets a flat in the final sprint which throws the entire weight of the team unto the front disk which slowly comes apart as the tire peels off.

I showed him that foregoing manufacturing errors that all of the bicycle materials have approximately the same loaded lifespan. That was sort of surprising to me since I have a lot of steel bikes and never had a failure. But I suppose I usually buy them with very little use and they simply don't have that many miles.

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Interesting.
Of course Sheldon Brown, that sneaky devil, describes a study
conducted by EFBe (Engineering for Bikes) which is now, I believe, one
of the main elements of the DIN 79100 bicycle-testing standard, which
was published in TOUR magazine of Oct 1997 ( more then 20 years ago)
that demonstrated that two of the three frames that completed the test
with no failures were welded aluminum frames. Two out of three... lets
see, that is about 66.666 %, isn't it?

The Christian Bible has a phrase that seems to apply here (Proverbs
17:28. New International Version)

"Even a fool is thought wise if he keeps silent, and discerning if he
holds his tongue."



It is silly to claim a particular material is prone to failure, when the
reliability is so heavily influenced by the design, construction, and use.

--
JS

Interesting track crashes
 

On Thu, 27 Dec 2018 13:21:30 +1100, James
wrote:

On 27/12/18 11:22 am, John B. Slocomb wrote:
On Wed, 26 Dec 2018 12:02:58 -0800 (PST), wrote:

On Thursday, November 29, 2018 at 1:25:28 PM UTC-8, Sir Ridesalot wrote:
An interesting video of track bicycles crashing. Amazing what happens when a tubular tire comes off the rim. I was surprised at how long one rider stayed up - he was okay until the front tire went under his rear wheel.

I saw bits flying around in some of the crashes but couldn't make out what those bits were.

https://www.youtube.com/watch?v=tf17hFikqrQ

Cheers

Track tubulars are paper thin so flats from overheating aren't all that uncommon. My friend who has turned into a total anti-carbon fiber nut sent me a video link to a subject he called "carbon fiber rim exploding under track rider." That isn't what I would have called it. If you look at it closely it looks like a track tandem gets a flat in the final sprint which throws the entire weight of the team unto the front disk which slowly comes apart as the tire peels off.

I showed him that foregoing manufacturing errors that all of the bicycle materials have approximately the same loaded lifespan. That was sort of surprising to me since I have a lot of steel bikes and never had a failure. But I suppose I usually buy them with very little use and they simply don't have that many miles.

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Interesting.
Of course Sheldon Brown, that sneaky devil, describes a study
conducted by EFBe (Engineering for Bikes) which is now, I believe, one
of the main elements of the DIN 79100 bicycle-testing standard, which
was published in TOUR magazine of Oct 1997 ( more then 20 years ago)
that demonstrated that two of the three frames that completed the test
with no failures were welded aluminum frames. Two out of three... lets
see, that is about 66.666 %, isn't it?

The Christian Bible has a phrase that seems to apply here (Proverbs
17:28. New International Version)

"Even a fool is thought wise if he keeps silent, and discerning if he
holds his tongue."



It is silly to claim a particular material is prone to failure, when the
reliability is so heavily influenced by the design, construction, and use.

Certainly. When I was in Vietnam I worked on airplanes (DC-3, USAF
C-47) that were only 2 years younger then I was :-)

The only structural failure in the fleet during the 18 months that I
was there was an elevator torque tube (connected the two elevators)
the failed on take off and it was thought that the failure might have
been caused by hostile fire.

cheers,

John B.

Interesting track crashes
 

On 2018-12-27 01:59, Frank Krygowski wrote:
On 12/26/2018 3:02 PM, wrote:

Actually the most common frame material to fail is aluminum. Come
sources say never keep an aluminum frame for more than 10 years max.
And the failures are highly reminiscent of the Internet pictures of
carbon fiber failures save that the CF bikes usually have been hit by
cars whereas the AL bikes simply fall apart.

Damn. Mine's 32 years old. I'll have to travel back to 1996 and get rid
of it.

But then I won't be able to ride it across the U.S. in 2003. What to do??

https://www.youtube.com/watch?v=EhU862ONFys

Don't forget to charge...

Interesting track crashes
 

On Wednesday, December 26, 2018 at 8:59:28 PM UTC-5, Frank Krygowski wrote:
On 12/26/2018 3:02 PM, wrote:

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Damn. Mine's 32 years old. I'll have to travel back to 1996 and get rid
of it.

But then I won't be able to ride it across the U.S. in 2003. What to do??

--
- Frank Krygowski

You're right Frank. Heck there are still quite a few Vitus spindly aluminium frames in use too.

We should have a poll for the biggest RBT Troll for 2018.

Cheers

Interesting track crashes
 

On Wednesday, December 26, 2018 at 4:22:08 PM UTC-8, John B. Slocomb wrote:
On Wed, 26 Dec 2018 12:02:58 -0800 (PST), wrote:

On Thursday, November 29, 2018 at 1:25:28 PM UTC-8, Sir Ridesalot wrote:
An interesting video of track bicycles crashing. Amazing what happens when a tubular tire comes off the rim. I was surprised at how long one rider stayed up - he was okay until the front tire went under his rear wheel.

I saw bits flying around in some of the crashes but couldn't make out what those bits were.

https://www.youtube.com/watch?v=tf17hFikqrQ

Cheers

Track tubulars are paper thin so flats from overheating aren't all that uncommon. My friend who has turned into a total anti-carbon fiber nut sent me a video link to a subject he called "carbon fiber rim exploding under track rider." That isn't what I would have called it. If you look at it closely it looks like a track tandem gets a flat in the final sprint which throws the entire weight of the team unto the front disk which slowly comes apart as the tire peels off.

I showed him that foregoing manufacturing errors that all of the bicycle materials have approximately the same loaded lifespan. That was sort of surprising to me since I have a lot of steel bikes and never had a failure. But I suppose I usually buy them with very little use and they simply don't have that many miles.

Actually the most common frame material to fail is aluminum. Come sources say never keep an aluminum frame for more than 10 years max. And the failures are highly reminiscent of the Internet pictures of carbon fiber failures save that the CF bikes usually have been hit by cars whereas the AL bikes simply fall apart.

Interesting.
Of course Sheldon Brown, that sneaky devil, describes a study
conducted by EFBe (Engineering for Bikes) which is now, I believe, one
of the main elements of the DIN 79100 bicycle-testing standard, which
was published in TOUR magazine of Oct 1997 ( more then 20 years ago)
that demonstrated that two of the three frames that completed the test
with no failures were welded aluminum frames. Two out of three... lets
see, that is about 66.666 %, isn't it?

The Christian Bible has a phrase that seems to apply here (Proverbs
17:28. New International Version)

"Even a fool is thought wise if he keeps silent, and discerning if he
holds his tongue."

cheers,

John B.

Of course anyone with any training would understand that this testing meant nothing. While the test itself was well designed using a single example of each frame yielded no more information that THAT single example.

But then you're the sort of engineer who would build a bridge without actually testing the components of it.