FAILURE Shimano Cranksets

Discuss light weight issues concerning road bikes & parts.

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Miller
Posts: 1915
Joined: Thu Sep 21, 2006 8:54 pm
Location: Reading, UK

by Miller

Tiberi is quoted on CN saying "I had a mechanical problem, my crank broke, and so I thought it was all over."
'My crank broke' could cover a multitude of sins of course.

XCProMD
Posts: 944
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

wingguy wrote:
XCProMD wrote:
Mon Sep 23, 2019 10:58 pm
Looks like we got another one today, didn’t we?
That looked a lot more like a mechanic failure than a component failure.
The crank broke. I know some at the Italian team.


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by Weenie


wingguy
Posts: 4321
Joined: Thu Mar 08, 2012 11:43 pm

by wingguy

XCProMD wrote:
Tue Sep 24, 2019 8:00 pm
The crank broke. I know some at the Italian team.
How did it break?

wingguy
Posts: 4321
Joined: Thu Mar 08, 2012 11:43 pm

by wingguy

Miller wrote:
Tue Sep 24, 2019 7:51 pm
Tiberi is quoted on CN saying "I had a mechanical problem, my crank broke, and so I thought it was all over."
'My crank broke' could cover a multitude of sins of course.
Sure looks to me like it means the pinch bolts weren’t done up properly...

XCProMD
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Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

It wasn’t the crankarms this time, but the spindle.Image


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mcrdave
Posts: 102
Joined: Sun Jan 04, 2009 9:24 pm
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by mcrdave

Another one this morning. Bought from Evans cycles new about 2.5 years ago so I guess no point in trying to pursue it.
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talltales
Posts: 143
Joined: Mon Mar 11, 2019 10:43 pm

by talltales

Is this an Ultegra only issue? - Cant remember seeing any broken 105 ?

Any failed R8000 or R7000 that "we" know about?

KevinPeters
Posts: 2
Joined: Mon Jan 13, 2020 5:14 pm

by KevinPeters

Add me to the list. Caught this just in time as the pedal felt strange all of a sudden. No cracking noises that I can remember. 3.5 years old, 9,000k. No crashes etc. I will try for a warranty replacement but I'm not hopeful.
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shotgun
Posts: 319
Joined: Tue Dec 30, 2008 3:38 pm
Location: Philippines

by shotgun

talltales wrote:
Tue Oct 15, 2019 10:11 pm
Is this an Ultegra only issue? - Cant remember seeing any broken 105 ?

Any failed R8000 or R7000 that "we" know about?
Happend to both my current series Dura Ace and Ultegra. I think i've posted 2 separate posts in this thread (with photos)
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schlafen
Posts: 77
Joined: Sun Mar 24, 2019 11:51 pm

by schlafen

My Dura Ace 9100 cranks failed a while ago as well. They were replaced under warranty no issues.
However, planning some trips this summer and I don't want to risk them failing again.

Has anyone tried to run 5800 105 cranks with a 9100 Dura Ace groupset? As far as I know they are one piece aluminium cranks, not bonded, but, there would be a slight weight penalty which I'm perfectly fine with.

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ghostinthemachine
Posts: 220
Joined: Thu May 07, 2015 9:18 pm

by ghostinthemachine

Aren't 5800 still forged hollow, instead of bonded?

schlafen
Posts: 77
Joined: Sun Mar 24, 2019 11:51 pm

by schlafen

ghostinthemachine wrote:Aren't 5800 still forged hollow, instead of bonded?
That's why I'm considering them. Just wondering if there are any ,issues compatibility wise, as they are a different generation/design maybe?

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ruklaw
Posts: 54
Joined: Sat Apr 19, 2014 12:45 pm

by ruklaw

I believe there is a slight spacing discrepancy so you might need to tweak the front derailleur slightly, it will work fine though.

You could probably also bring the weight down a bit by using the dura ace rings on the 5800 cranks (this might also mitigate the above adjustment requirement).

robertbb
Posts: 1616
Joined: Thu Jul 23, 2009 3:35 am
Location: Melbourne, Australia

by robertbb

Are the new R7000 cranks also hollow forged?

by Weenie


Cemicar
Posts: 250
Joined: Mon Aug 21, 2017 7:40 am

by Cemicar

robertbb wrote:
Sun Jan 19, 2020 12:55 am
Are the new R7000 cranks also hollow forged?
It appears the chainrings are now constructed in the same way as Ultegra and Dura-Ace, so there isn't really a big weight difference between chainrings in the R9100/8000/7000 gen.

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