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PostPosted: Fri Dec 23, 2016 4:00 am 
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Joined: Wed Aug 01, 2012 12:53 am
Posts: 1
Kindly comment if you or a friend experience this. Scary I might say...catastrophe waiting to happen.
Image

Sent from my Redmi 4 using Tapatalk


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Posted: Fri Dec 23, 2016 4:00 am 


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PostPosted: Fri Dec 23, 2016 4:15 am 
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Joined: Thu Aug 06, 2015 12:37 pm
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Location: NC
Replaced one two weeks ago for a client for the same thing. It's not the first was ultergra


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PostPosted: Fri Dec 23, 2016 4:20 am 
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Posts: 606
Sh!t happens.

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PostPosted: Fri Dec 23, 2016 10:25 am 
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Joined: Wed Dec 14, 2011 2:47 pm
Posts: 162
Location: Hong Kong
These always happen in Taiwan :
http://www.mobile01.com/topicdetail.php?f=316&t=4849613


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PostPosted: Fri Dec 23, 2016 2:12 pm 
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Joined: Thu Mar 08, 2012 11:43 pm
Posts: 3329
That's impressive! Though given the sheer number of 6800 chain sets out there the failure rate must be microscopic still,

Ref Taiwan, are you thinking that lightweight Aluminium chain sets have more of a weakness in countries that are very hot and very wet?


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PostPosted: Fri Dec 23, 2016 5:54 pm 
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Joined: Thu Jul 14, 2011 10:10 pm
Posts: 247
Must be something in glue/bonding method susceptible to failure in wet and hot conditions


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PostPosted: Fri Dec 23, 2016 6:19 pm 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8506
Location: Los Feliz, Los Angeles, California
But that's impossible! Shimano components are infallible and perfect!
That must be photoshop!

(sarcasm)

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PostPosted: Fri Dec 23, 2016 8:37 pm 
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Joined: Wed Feb 03, 2010 1:31 am
Posts: 665
The new crank arm on the right looks good. But the pedal looks like garbage. Does this rider drag the bike for hours every day with the pedal in gravel? How does a pedal get to look like that? Broken crank on left. Breaking the tip of the rank off is not good. But the whole crank arm looks like he dipped it in acid every day for a year and pounded on it with a hammer and roughed it up with a grinder. The chainring looks like it is sort of newish. But the crank arm? No wonder it broke. Despite the broken crank arm, this is a much better picture of bike part abuse and how to destroy bike parts. I would never blame Shimano for this.


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PostPosted: Fri Dec 23, 2016 8:48 pm 
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Location: Los Feliz, Los Angeles, California
^^^^^^

Now that's sarcasm!

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PostPosted: Fri Dec 23, 2016 8:52 pm 
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Joined: Fri May 25, 2007 6:43 pm
Posts: 3304
The crank arm on the right is the front half of the hollowtech forging. The left hand is the inside/back half of the forging.

You'd need the parts in front of you to work out the actual failure mode.

But, at a guess, I'd put this at shimanos door. Probably a slip up in the forging process .


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PostPosted: Fri Dec 23, 2016 8:52 pm 
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Joined: Fri May 25, 2007 6:43 pm
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prendrefeu wrote:
^^^^^^

Now that's sarcasm!
nah. Just not looking at the picture carefully enough.


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PostPosted: Fri Dec 23, 2016 9:03 pm 
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It's just cosmetic.

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PostPosted: Fri Dec 23, 2016 9:17 pm 
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Joined: Sat Jul 29, 2006 2:36 am
Posts: 1353
Location: UK
RussellS wrote:
The new crank arm on the right looks good. But the pedal looks like garbage. Does this rider drag the bike for hours every day with the pedal in gravel? How does a pedal get to look like that? Broken crank on left. Breaking the tip of the rank off is not good. But the whole crank arm looks like he dipped it in acid every day for a year and pounded on it with a hammer and roughed it up with a grinder. The chainring looks like it is sort of newish. But the crank arm? No wonder it broke. Despite the broken crank arm, this is a much better picture of bike part abuse and how to destroy bike parts. I would never blame Shimano for this.


You say some very strange things..............


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PostPosted: Fri Dec 23, 2016 9:38 pm 
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Joined: Fri Jul 18, 2008 8:25 pm
Posts: 272
Location: UK
Calnago wrote:
It's just cosmetic.

Bit more than cosmetic, but luckily the failure mode is ideal to simply Loctite it back in place.


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PostPosted: Fri Dec 23, 2016 9:53 pm 
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Joined: Sun Oct 05, 2014 11:51 pm
Posts: 1240
do you even watts bro?


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Posted: Fri Dec 23, 2016 9:53 pm 


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