FAILURE Shimano Cranksets

Discuss light weight issues concerning road bikes & parts.
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erwinpat
Posts: 1
Joined: Wed Aug 01, 2012 12:53 am

by erwinpat

Kindly comment if you or a friend experience this. Scary I might say...catastrophe waiting to happen.
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1swiftvelo
Posts: 51
Joined: Thu Aug 06, 2015 12:37 pm
Location: NC

by 1swiftvelo

Replaced one two weeks ago for a client for the same thing. It's not the first was ultergra

by Weenie


Rippin
Posts: 610
Joined: Thu Feb 19, 2004 9:58 am

by Rippin

Sh!t happens.
____o
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(*)/ (*)

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toiyuet
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by toiyuet


wingguy
Posts: 4198
Joined: Thu Mar 08, 2012 11:43 pm

by wingguy

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?

victorduraace
Posts: 249
Joined: Thu Jul 14, 2011 10:10 pm

by victorduraace

Must be something in glue/bonding method susceptible to failure in wet and hot conditions

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prendrefeu
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by prendrefeu

But that's impossible! Shimano components are infallible and perfect!
That must be photoshop!

(sarcasm)
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RussellS
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Joined: Wed Feb 03, 2010 1:31 am

by RussellS

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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prendrefeu
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by prendrefeu

^^^^^^

Now that's sarcasm!
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mattr
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Location: The Grim North.

by mattr

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 .

mattr
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by mattr

prendrefeu wrote:^^^^^^

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

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Calnago
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by Calnago

It's just cosmetic.
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5 8 5
Posts: 1353
Joined: Sat Jul 29, 2006 2:36 am
Location: UK

by 5 8 5

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..............

dynaserve
Posts: 272
Joined: Fri Jul 18, 2008 8:25 pm
Location: UK

by dynaserve

Calnago wrote:It's just cosmetic.

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

jeffy
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Joined: Sun Oct 05, 2014 11:51 pm

by jeffy

do you even watts bro?

by Weenie


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