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SYST6
PostPosted: Wed Nov 28, 2007 1:00 pm 
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wholeheartedly. on my asx titan the axle / spider literally twisted in the carbon fiber literally leaving pedals at 2 o'clock/ 6 o'clock. Further, I was only given partial credit on the cranks which I used to purchase second pair of record cranks :D
No problems with the record/ second stiffest cranks i've ever used w/ tighter q factor than time !
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Weenie
Posted: Wed Nov 28, 2007 1:00 pm 


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zebragonzo
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PostPosted: Wed Nov 28, 2007 1:39 pm 
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What I would ask is if you'd crashed on these bikes before?

There tends to be some sort of impact that causes delamination for spontaneous failure of this standard being as carbon doesn't exhibit most metal trends for failure modes.
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Paulo Casalta
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PostPosted: Wed Nov 28, 2007 2:18 pm 
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The only crash I had was dued to the failure of the crankset :x
No previous damage or impact on my case.
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zebragonzo
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PostPosted: Wed Nov 28, 2007 2:42 pm 
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I suppose it's down to the manufacturer then. I've had a lecure this morning about why CF fails!
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mises
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PostPosted: Wed Nov 28, 2007 4:02 pm 
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To me it's bad design or bad manufacturing. If low weight was the problem then THM would be having significantly more failures than Stronglight/Time.

It's still largely manual work and all you need is one lazy employee who decides his job would be easier doing the layup his way.
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Coolhand
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PostPosted: Wed Nov 28, 2007 7:11 pm 
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Speedgoat had something in their bikeblog a while back about Time crank failures as well.

FYI

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DocRay
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PostPosted: Wed Nov 28, 2007 9:44 pm 
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Paulo Casalta wrote:
So, for as much as you hate carbon stuff, your words are nothing but unfair and bitter.


My opinion is that carbon fiber is not a material with universal applications in cycling. It has it's place, just not everywhere.
I ride a carbon bike with carbon wheels.
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DocRay
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PostPosted: Wed Nov 28, 2007 9:48 pm 
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zebragonzo wrote:
There tends to be some sort of impact that causes delamination for spontaneous failure of this standard being as carbon doesn't exhibit most metal trends for failure modes.


That's true, it really doesn't fatigue, but inproper resin penetration and curing will get worse with time and use.
Porosity is problem with metal castings, but the industry has dealt with this very well.

Of course, this could all just be very bad luck.
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Alpinist
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PostPosted: Sun Jan 13, 2008 4:28 pm 
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I lost 3 bolts. Upon removing the small chain ring, I found 3 eyelets cracked.
I will replace the time crank set with another brand. I'm glad I did not have a failure while riding.

2 thumbs down for Time cranks.

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beatnik
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PostPosted: Wed Jan 16, 2008 7:40 pm 
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I doesn´t surprise to me. Yours is not the first i see.

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Sasha011
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PostPosted: Wed Jan 16, 2008 7:47 pm 
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does anyone have the picture of the duar-ace left crankarm hanging on the shoe of a discovery rider after a fall??? it is from the 2005 season and i think it is manuel beltran...
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beatnik
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PostPosted: Wed Jan 16, 2008 7:48 pm 
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Image

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http://weightweenies.starbike.com/forum ... 8e319d185b
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Irish
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PostPosted: Wed Jan 16, 2008 7:50 pm 
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THIS COULD BE THE VERY REASON CAMPAG USE SMALLER CHAINRING BOLTS ON THIER CRANKS = MORE MATERIAL +GREATER STRENGHT
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jipperd
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PostPosted: Wed Jan 16, 2008 7:50 pm 
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Sasha011 wrote:
does anyone have the picture of the duar-ace left crankarm hanging on the shoe of a discovery rider after a fall??? it is from the 2005 season and i think it is manuel beltran...


It was Benoit Joachim in the 2005 Vuelta:

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http://weightweenies.starbike.com/forum ... p?id=23809

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Last edited by jipperd on Wed Jan 16, 2008 7:52 pm, edited 2 times in total.

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beatnik
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PostPosted: Wed Jan 16, 2008 7:52 pm 
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That crankarm is not broken at all :lol:

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Last edited by beatnik on Wed Jan 16, 2008 8:01 pm, edited 1 time in total.

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Weenie
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Posted: Wed Jan 16, 2008 7:52 pm 


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