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Re: FAILURE Shimano Cranksets

Posted: Tue Sep 24, 2019 7:51 pm
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.

Re: FAILURE Shimano Cranksets

Posted: Tue Sep 24, 2019 7:51 pm
by Weenie

Re: FAILURE Shimano Cranksets

Posted: Tue Sep 24, 2019 8:00 pm
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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Re: FAILURE Shimano Cranksets

Posted: Tue Sep 24, 2019 11:48 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?

Re: FAILURE Shimano Cranksets

Posted: Tue Sep 24, 2019 11:49 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...

Re: FAILURE Shimano Cranksets

Posted: Fri Oct 04, 2019 9:50 pm
by XCProMD
It wasn’t the crankarms this time, but the spindle.Image


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Re: FAILURE Shimano Cranksets

Posted: Tue Oct 15, 2019 8:39 pm
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.
EG6RYatWwAEjFL2.jpeg

Re: FAILURE Shimano Cranksets

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

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

Re: FAILURE Shimano Cranksets

Posted: Tue Jan 14, 2020 10:14 am
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.
2020-01-11 12.06.07.jpg
2020-01-11 12.06.25.jpg

Re: FAILURE Shimano Cranksets

Posted: Tue Jan 14, 2020 10:21 am
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)

Re: FAILURE Shimano Cranksets

Posted: Sat Jan 18, 2020 9:23 am
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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Re: FAILURE Shimano Cranksets

Posted: Sat Jan 18, 2020 2:25 pm
by ghostinthemachine
Aren't 5800 still forged hollow, instead of bonded?

Re: FAILURE Shimano Cranksets

Posted: Sat Jan 18, 2020 2:57 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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Re: FAILURE Shimano Cranksets

Posted: Sat Jan 18, 2020 6:14 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).

Re: FAILURE Shimano Cranksets

Posted: Sun Jan 19, 2020 12:55 am
by robertbb
Are the new R7000 cranks also hollow forged?

Re: FAILURE Shimano Cranksets

Posted: Sun Jan 19, 2020 12:55 am
by Weenie

Re: FAILURE Shimano Cranksets

Posted: Sun Jan 19, 2020 3:03 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.