FAILURE Shimano Cranksets

Discuss light weight issues concerning road bikes & parts.
Philbar72
Posts: 175
Joined: Tue Sep 17, 2013 9:47 am

by Philbar72

i had a pioneer dura ace crank fail on me earlier this year. it made an audible "ping" during a sign sprint, then 70 miles later (2 miles from home), i got out of the saddle and the left arm folded so i went left and the arm went right and under the bike impaling my left calf with the chaining as it was dragged underneath. the damage was where the PM module was attached.

a couple of people were consulted. one reccomended (he's a fellow of engineering and specialises in metals and manufacturing techniques) that rather than go for silly lightweight stuff i go for more reliable materials, i.e. heavier cranksets, and reccomended 105 or the alloy praxis works stuff.

i got a full refund, so not so bad and Pioneer had said they'd never seen anything like this happen before ( they took a look at the crankarm...).

long story short, i've given up with power, and also have gone for more reliable cranks on my training bike.

mattr
Posts: 4673
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Nope, the pedal insert falls out.
Or the crank comes unstuck from the axle.

That's how all the ones I've seen (either in person or on the net) have failed. I've probably seen almost as many failed carbon cranks as there are failed Shimano cranks on this thread.

by Weenie


XCProMD
Posts: 799
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

Exactly.

FSA’s were quite prone to loose insert failure, Specs a bit less.

I have only once seen a Red crank with a loose spindle.

That’s quite a safer failure mode, as the pedal doesn’t fall apart unexpectedly. Can also be repaired if that’s what you fancy, I’ve done a number of them.

Lightnings of the past used to crack at the pedal spindle end, the insert created a stress riser at the carbon tube. That was also dangerous and I know a guy that had a nasty injury he can thank an early MTB Lightning for

XCProMD
Posts: 799
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

I got another call from one of our biking mates in Sweden, looks like another DA crank about to fail.

Just googled “Shimano broken crank” and got this hit, read the comments section. There will ever be a recall or will Shimano try to sweep this under the carpet as in previous cases?

http://carlinthecyclist.com/epic-failur ... eed-crank/

Darceking
Posts: 159
Joined: Fri Feb 28, 2014 1:48 am

by Darceking

I had another DA9000 fail today. 2nd one in just under 3 years.....

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pdlpsher1
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Joined: Thu Jul 19, 2012 6:09 pm
Location: CO

by pdlpsher1

Darceking wrote:I had another DA9000 fail today. 2nd one in just under 3 years.....
Do you live near the ocean or live in a humid environment? That’s a really high failure rate in regards to you specifically.


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XCProMD
Posts: 799
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

I have contact with clubs in Sweden -Stockholm, Sörmland, Dalarna-, Italy -Lombardy and Veneto and Spain -Cantabria and Basque Country-

Very different climate being the last two the only truly oceanic and very much so as the vicinity of the mountains make for a quite corrosive environment, especially in Cantabria, more the more to the west.

By no means a scientific statistic and the sample is still too low but I don’t see any pattern regarding climate and number of failures.

These things simply snap. Most of them don’t but the possibility of it happening is much higher than for any other high end crank.

shotgun
Posts: 256
Joined: Tue Dec 30, 2008 3:38 pm
Location: Philippines

by shotgun

pdlpsher1 wrote:
Thu Jan 03, 2019 4:30 pm
Darceking wrote:I had another DA9000 fail today. 2nd one in just under 3 years.....
Do you live near the ocean or live in a humid environment? That’s a really high failure rate in regards to you specifically.


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Weather is most likely a factor. Tropical/humid weather. I've had an Ultegra 6800 crank break, with another teammate with the same model. Also heard from my LBS that a couple of local pros they service had similar issues with Dura Ace 9000 cranks.
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martinkartin
Posts: 32
Joined: Thu Jul 06, 2017 5:21 am

by martinkartin

Just purchased a 9100 crankset. Has anyone run into any issues? I live in a warm tropical climate with a ton of rain half the year. I hope I can make it last.
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froze
Posts: 130
Joined: Thu Aug 05, 2010 3:47 am

by froze

is it by some odd chance a counterfeit shimano?

Darceking
Posts: 159
Joined: Fri Feb 28, 2014 1:48 am

by Darceking

My first one was replaced by Shimano Australia and it broke also, so I doubt it

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Mockenrue
Posts: 479
Joined: Mon Aug 20, 2012 10:32 am
Location: UK

by Mockenrue

This happened to a mate out training this morning. 35km one-legged drill to get home:

Image
Image

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F45
Posts: 993
Joined: Wed Jun 08, 2011 6:08 am

by F45

Looks like the glue failed.

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cveks
Posts: 122
Joined: Mon Aug 21, 2017 8:15 pm
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by cveks

Mockenrue wrote:
Sat Feb 09, 2019 3:10 pm
This happened to a mate out training this morning. 35km one-legged drill to get home:

Image
Image
its disgrace for Shimano still using aluminium crankset in Dura Ace range. People pay to price for Dura Ace but they dont get top quality it seems.

As I heard carbon cranksets never get broken.

by Weenie


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posaunemeister
Posts: 21
Joined: Fri May 24, 2019 12:32 pm
Location: Tulsa, OK

by posaunemeister

I've never once had this happen to my late-generation FSA ABS cranksets. They are lighter and measurably stiffer than Dura-Ace, and the shifting is excellent. They are plentiful on eBay at the moment and can be had for half the cost. You should check them out.
"When I was young, I admired clever people. Now that I am old, I admire kind people." - Abraham Joshua Heschel

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