ouch!

dvt said:

Peter Cole said:

dvt said:

Peter Cole wrote:

> Interesting photo -- I wonder whether it was a chain problem (jam or
> snap) that sent him forward, breaking the steer tube, or the other
> way around?

I think the front wheel is too compressed to be caused by a chain
problem. Heck, the wheel is still compressed and the handlebars are
no longer attached. And the back wheel is still off the ground. I'd
say it's a post-jump photo.

I agree with Phil... there is probably nothing wrong with the
derailer and drivetrain in this photo. The chain is just continuing
its path downward while the ground stops the rest of the bike. Again,
I think it's a photo of the landing from the jump.

Quoted message said:

Nah, a jump couldn't cause that much slack.

I don't agree. The chain is on the small ring, and although we can't
tell which cog it's on, it's safe to say that the chain has plenty of
slack available.

On second look, maybe you're right. Perhaps the impact sagged the chain,
then the deceleration pulled it forward with the cage.

"Llatikcuf" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

http://www.velonews.com/images/news/9076.13096.f.jpg

Here's the text associated with the picture. It pretty much
explains what happened. -- Jay Beattie.

http://www.velonews.com/news/fea/9082.0.html

Lew said:

Jobst can speak for himself on this, but, uh, I am pretty sure that he
maintains that the wheel does indeed stand on the spokes. Looks to me
like he is correct!

Actually, it more or less does both, or neither, depending on how close
you go. The wheel 'stands' on the bottom spokes losing a large amount of
tension while the top spokes gain a teensy bit (but not correspondingly
much). So you could *either* interpret that as standing on the bottom
spokes (if you subtract static tension from the spoke tensions, it looks
like the bottom spokes are in compression, like they would be when
standing on them), or you could interpret it as hanging from the top
spokes -- while the bottom spokes don't pull down so much any more.

Jasper

Llatikcuf said:

While he was laying on the ground, he was asking his dad to pick up the
headset bearings and other parts so he could rebuild and give her
another go!

I wonder if his bottom race was brinelled.

Jasper

Llatikcuf said:

http://www.velonews.com/images/news/9076.13096.f.jpg

Whoa I'm such a good internet researcher. I can't believe nobody else found
this link. It describes what happened:

http://www.velonews.com/news/fea/9082.0.html
--
Phil, Squid-in-Training

Llatikcuf said:

Story behind the photo:

http://www.velonews.com/news/fea/9082.0.html

"Hello,
Becky Brandt's dad here. Becky is at school right now, so I am writing
in on her behalf. She took that photo at the WORS Ultimax Challenge in
Sheboygan, Wisconsin, on October 9th of this year. It was the
citizen/beginner race in the area simply called "the log jump." This
guy hit the jump pretty fast, but never pulled up on the bars at all.
The fork steer tube sheared at the threads when he was landing. He
turned out to be okay. Nonetheless, they took him in for a visit to the
hospital as a precaution.

While he was laying on the ground, he was asking his dad to pick up the
headset bearings and other parts so he could rebuild and give her
another go!

If this is an accurate description of what happened, this means that
the stem had nowhere near enough insertion. A properly inserted stem
cannot fail this way, the contact point being well below the threads.
Shear off the top of the steerer at the threads and the stem is still
securely attached to what remains of the steer tube.

The link someone else posted to an eBay auction shows a very similar
frame, but not the stem and headset. Or bars, for that matter.

The guy should learn some elementary bicycle repair before giving her
another go.

Dept. of Famous Last Words: "Get me back on my bike"
†

41 said:

Llatikcuf said:

Story behind the photo:

http://www.velonews.com/news/fea/9082.0.html

"Hello,
Becky Brandt's dad here. Becky is at school right now, so I am
writing in on her behalf. She took that photo at the WORS Ultimax
Challenge in Sheboygan, Wisconsin, on October 9th of this year. It
was the citizen/beginner race in the area simply called "the log
jump." This guy hit the jump pretty fast, but never pulled up on the
bars at all. The fork steer tube sheared at the threads when he was
landing. He turned out to be okay. Nonetheless, they took him in for
a visit to the hospital as a precaution.

While he was laying on the ground, he was asking his dad to pick up
the headset bearings and other parts so he could rebuild and give her
another go!

If this is an accurate description of what happened, this means that
the stem had nowhere near enough insertion. A properly inserted stem
cannot fail this way, the contact point being well below the threads.
Shear off the top of the steerer at the threads and the stem is still
securely attached to what remains of the steer tube.

This is why threaded headsets are dangerous! Nothing like this would ever
happen on a threadless headset. 😉
--
Phil, Squid-in-Training

Mark Janeba said:

Leo Lichtman said:

When I first looked at the picture, I thought I saw a kickstand, which would
mean it is a posed picture. However, I think that dark line is his chain,
which means that this poor guy is flapping at both ends.

Agreed. Double ouch.

It looks to me like a quill stem - what do others think?

Looks like it to me; no evidence of a clamp, and that sure looks like
the upper half of a headset on the quill.

Quoted message said:

So does that mean his steerer column separated somewhere in the threaded
section?

As a first guess, I'd say that's probably it.
--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

Dave Reckoning said:

What has happened to this rider is that he has broken his sterer column,
perhaps from a bulge created when he tightened the stem too tight inside it.

I think that's likely...

Quoted message said:

His straddle cable was supported through the stem and as a result when the
stem went down the straddle cable hooked onto the knobblies in the front
tire.

I don't think this has much to do with what's happening in the
photo...

Quoted message said:

This pretty well locks the front wheel, causing his front tire to bulge at
the bottom with the force of the deceleration and causing bicycle to
decelerate faster than him and his chain (thus pushing the chain forward as
seen in the picture)

Deceleration alone wouldn't flatten the tire (and flex the spokes!)
like that. The most weight brakes along could place on the front
wheel is the weight of the rider and bike (and that's not nearly
enough to do what you see in the photo). Also, it's clear that the
chain is being pulled DOWN, not forward.

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame

Lew said:

Quoted message said:

Quoted message said:

*the bottom 3 spokes on the front wheel are visibly BENT*

Quoted message said:

Quoted message said:

I guess this answers our spokes hanging vs. standing debate.

David said:

Great observation - I did not notice that the first time I saw this photo 2
weeks ago. The bent spokes clearly indicate that jobst is most likely wrong
that a wheel hangs on the spokes versus stands on them. If it were to hang
on the spokes the hanging spokes may have yielded. Though, I am not sure
that would be visibile in the photo.

Jobst can speak for himself on this, but, uh, I am pretty sure that he
maintains that the wheel does indeed stand on the spokes. Looks to me
like he is correct!

Exactly - if the bike wasn't "standing" on the bottom spokes, they'd
still be straight (spokes don't do a very good job of supporting
weight without tension). The whole "standing/hanging" thing is just
based on your perspective - and on relative tension. Jobst is right
when you consider that all the tension changes in a working wheel
occur in the bottom spokes (just like they do with a wagon wheel).

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame

In article <[email hidden]>,

Quoted message said:

someone writes:

http://www.velonews.com/images/news/9076.13096.f.jpg

That's what I love about carbon steer tubes, but why did his chain
fall off at the same time?

Jobst Brandt

I'm guessing he just landed from a jump.

--
B.B. --I am not a goat! thegoat4 at airmail dot net

Mark Hickey <[email hidden]> wrote in
news:[email hidden]:

Quoted message said:

Llatikcuf said:

http://www.velonews.com/images/news/9076.13096.f.jpg

Is it my imagination, or is the top half of the headset going along
for the ride? That can't have ended well...

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame

My God I bet that hurt!

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Mark Hickey <[email hidden]> wrote in
news:[email hidden]:

Quoted message said:

Llatikcuf said:

http://www.velonews.com/images/news/9076.13096.f.jpg

Is it my imagination, or is the top half of the headset going along
for the ride? That can't have ended well...

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame

My God I bet that hurt!

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Mark Hickey <[email hidden]> wrote in
news:[email hidden]:

Quoted message said:

Llatikcuf said:

http://www.velonews.com/images/news/9076.13096.f.jpg

Is it my imagination, or is the top half of the headset going along
for the ride? That can't have ended well...

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $795 ti frame

My God I bet that hurt!

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