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ls01 02-21-10 03:53 PM


Originally Posted by a_phat_beat (Post 10432119)
probably had both hands on the bars, as those snapped off, the other hand took control.


Uhhh. yeah, thanks for the obvious. but throw in the surprise element and crash or not I still would be looking for a new chamois afterwords. I guess I am just getting old, too afraid of pain.

bdcheung 02-21-10 03:54 PM

If your fit is right, there isn't that much weight on your hands.

umd 02-21-10 04:11 PM

I was expecting the pot hole, and braced for it. I wasn't expecting the bar to come apart but I was expecting a big jolt so it wasn't a complete surprise. Plus what bdcheung said, not much weight on my hands.

baj32161 02-21-10 04:11 PM


Originally Posted by FlatSix911 (Post 10429616)
Words to the Wise ... :thumb:

  • Plastic is Fantastic
  • Steel is Real
  • Ti is Hi

Tin is in!:D

bdcheung 02-21-10 04:19 PM


Originally Posted by umd (Post 10432370)
I was expecting the pot hole, and braced for it. I wasn't expecting the bar to come apart but I was expecting a big jolt so it wasn't a complete surprise. Plus what bdcheung said, not much weight on my hands.

pot hole was too big to bunny hop? especially if you were expecting and bracing for it.

coasting 02-21-10 04:22 PM


Originally Posted by baj32161 (Post 10432379)
Tin is in!:D

you should apologise for that one.

coasting 02-21-10 04:23 PM

i'm curious about these funny shaped bars. do they suit you because you spend a lot of time in the drops? i spend most time on the hoods or tops, but i'm starting to wonder if it isn't because of the shape of my bars that i don't use the drops more.

on past rides, when i got lower back pain i could relieve it by getting lower and using the drops.

ls01 02-21-10 04:27 PM


Originally Posted by umd (Post 10431956)
My aluminum cranks were fine, then they weren't. Mad skillz kept me upright then too, as I was standing & accelerating out of a corner.

http://www.photoscene.com/kimandsteve/images/1464.jpg

Got any shots of the end in focus? I would be surprised not to find an area of darker color in the area where the break occurred. This discolored area is the crack propagating from the notch created when the pedals were tightened onto the crank arm. The dark area is where the crack started and oxidized, and most likely would start at the side of the crank arm the pedal screwed into. This is why a lot of newer modern alloy and carbon crank sets come with a steel washer that fits into the crank arm, to prevent this type of galling,which creates the notch. But under normal use would probably have lasted a long time but with your higher out put greatly reduced the life span of the crank end.
The point is they were fine to you until they broke. Had you examined them earlier and found the crack before failure what then?

umd 02-21-10 04:57 PM

Upon inspection after the break (of the crank), it was apparent that there was a micro crack that probably could have been spotted if one checked it over every day with a magnifying glass. Seriously, who is going to do that, especially for a part like bars that are under tape. It's not common, sure, but my point is that there were no obvious warning signs and it was a catastrophic failure. Carbon may be more prone to it, and the warning signs more hidden, but aluminum is not immune.

umd 02-21-10 04:58 PM


Originally Posted by coasting (Post 10432421)
i'm curious about these funny shaped bars. do they suit you because you spend a lot of time in the drops? i spend most time on the hoods or tops, but i'm starting to wonder if it isn't because of the shape of my bars that i don't use the drops more.

on past rides, when i got lower back pain i could relieve it by getting lower and using the drops.

I wouldn't really say that they are "funny shaped." These days "classic bend" bars seem to be in the minority. I do spend a lot of time in the drops, especially when racing or otherwise riding agressively (see the thread a week or so ago about this subject).

umd 02-21-10 05:01 PM


Originally Posted by bdcheung (Post 10432402)
pot hole was too big to bunny hop? especially if you were expecting and bracing for it.

I considered hopping it but it was really big (long) and my experience with holes that size is that I usually end up landing on the edge and making things worse. It wasn't really a pot hole, but that seemed to be the most expedient way to describe it.

ls01 02-21-10 06:13 PM


Originally Posted by umd (Post 10432519)
Upon inspection after the break (of the crank), it was apparent that there was a micro crack that probably could have been spotted if one checked it over every day with a magnifying glass. Seriously, who is going to do that, especially for a part like bars that are under tape. It's not common, sure, but my point is that there were no obvious warning signs and it was a catastrophic failure. Carbon may be more prone to it, and the warning signs more hidden, but aluminum is not immune.

I agree that aluminum, actually nothing is immune given the right set of variables. but without the inspection one never knows for certain. That is the point I was making, most times we only learn of a problem after its to late with aluminum. with carbon its even harder to spot the problems because so much less is necessary to cause a failure. I am not saying to inspect your bike with a jewlwers loop, I say learn from these things, know that the curl of aluminum coming off the crank arm as you tighten the pedal on is a warning sign. ( I exagerate for illustation purposes) The micro crack tells the story, It presented as a catastrophic failure, but upon further inspection its not really. Could you have found it if you did inspect it before failure? who knows, but there was a chance. carbon would have let go when the micro fracture occured.
I am not saying that there is anything wrong with any of these materials except the reputation that they get when the facts arent looked at completely.
Justs for fun, there used to be a web site for failures like this one many good examples on there.

rangerdavid 02-21-10 06:23 PM

1 Attachment(s)
Gotta really be careful with those potholes. You never know how deep they might be!!

Attachment 138499


:lol:

HigherGround 02-21-10 07:00 PM


Originally Posted by big john (Post 10431760)
Anybody remember BF member SirLanceI'm not? He crashed on Deer Creek and broke his frame. He transferred all the parts to a new frame and the bars broke while descending Mount Baldy a couple weeks later. He did not crash, but the bars snapped on both sides near the stem. He was probably going 35mph when he hit a concrete swale across the road. Mad skillz, indeed.

umd, glad to hear you're still with us.

Do you recall if the bars were aluminum or carbon fiber?

ls01 02-21-10 07:06 PM


Originally Posted by HigherGround (Post 10432976)
Do you recall if the bars were aluminum or carbon fiber?


Sounds like classic over torqued carbon. But I have no first hand knowledge of this incident.

mazdatech10 02-21-10 07:36 PM

thats why i still use alloy bars

fly:yes/land:no 02-21-10 08:15 PM

this has been covered already, but dude - nice save. seriously. you could have jens voigted.

mzeffex 02-21-10 08:19 PM

Glad you're okay, that's funny you continued to ride even after. Assuming they're like a carbon frame (one chip and the rest can fail), they could have broken more at any given moment?

umd 02-21-10 09:01 PM

Wut

ls01 02-21-10 09:18 PM


Originally Posted by umd (Post 10433422)
Wut

why is it so funny when you do this?

mzeffex 02-21-10 09:19 PM

sigh

Since they were broken they could have continued to fail during the ride, right?

umd 02-21-10 10:00 PM


Originally Posted by mzeffex (Post 10433500)
Since they were broken they could have continued to fail during the ride, right?

No. Not any more likely to fail than before. I figured if I avoided bike swallowing potholes for the rest of the ride I would be fine.

mzeffex 02-21-10 10:02 PM

Ah, alright.

umd 02-21-10 10:07 PM

Plus I was out in the middle of friggen nowhere

JimF22003 02-22-10 02:45 AM

Looks like that carbon flew out on you. Over time.


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