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Shimano Ultegra 6800 Crank arm (53-39 172.5) snapped



  • Registered Users Posts: 194 ✭✭slow

    I experienced a wonky driveside pedal which turned out to be a crank about to shear completely about 50mm from the pedal. Less than 2 years old...

  • Registered Users Posts: 1,492 ✭✭✭hesker

    For anyone who has suffered similar failures outside the 2 year window it might be worth getting in touch directly with Shimano. They might provide support where an LBS may not.

  • Moderators, Sports Moderators Posts: 19,965 Mod ✭✭✭✭Weepsie

    Wonder if they'd support a failure on say a stages dual sided one or a pioneer one if it was similar.

  • Registered Users Posts: 1,010 ✭✭✭Arequipa


    I had an Ultegra 6800 crank.. with a fair few Kms on it..

    Felt a click or weakness on the left side and found a crack right across the inside of the left clamp arm, opposite the pedal on the inside...

    Out of wannanty...was quite disappointed.. it is clever to have only a X2 year warranty...

  • Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 48,646 CMod ✭✭✭✭magicbastarder

    when did it happen? Mercian Pro got them to agree to a replacement, out of warranty.

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  • Registered Users Posts: 1,010 ✭✭✭Arequipa


    I think it cracked and failed around Summertime 2021..

    I contacted Shimano via Facebook Messanger.

    They said that the warranty terms were X2 years and to contact a local Shimano supplier ..

    I contacted my local shop,who said they would have a charge to assess the damage and then could decide whether it was a defect etc.. I cannot remember exactly.. but it all seemed more hassle than it was worth!

  • Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 48,646 CMod ✭✭✭✭magicbastarder

    you may just have gotten through to a lowly intern on their facebook page.

  • Registered Users Posts: 1,492 ✭✭✭hesker

    Still worth contacting Madison, the Shimano agent as Mercian Pro did.

    I had similar success on a Campag shifter with the main Campag UK service centre who did a repair FOC on a shifter that was 7 years old.

  • Registered Users Posts: 599 ✭✭✭transylman

    Another member to the cracked Shimano crank club here. It had been making a creaking noise for a while but I though it was loose pedal or bottom bracket failing. I noticed on a ride yesterday that the my drive side foot was doing a lot of wobbling around but assumed it was problem with loose cleat. Just spotted the crack randomly this evening.

    Bike bought in 2016, but I don't do a lot of miles and am definitely not putting out a high level of Watts. After doing some research I am discovering that it appears to be a major design issue with the hollowtech groupsets, with a lot failing after around 5 years due to moisture getting in to the hollow and galvanic corrosion destroying the aluminium over time.

    Given that it appears to be a design flaw, do I have any hope of a replacement?

  • Registered Users Posts: 16,668 ✭✭✭✭dahat

    5 years old so irregardless of problems & low kms I’d be sure you have no comeback unfortunately.

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  • Moderators, Sports Moderators Posts: 24,548 Mod ✭✭✭✭CramCycle

    I'd disagree, a warranty is effectively just a marketing tool. A product has an expected lifetime, albeit not well defined. I would expect cranks, where no crashes involved, to last longer than 5 years. I have had plenty last longer. Warranties just trick alot of people into thinking they can only get sorted within a year or two but legally that's just not true. Sadly they usually get away with it due to it being to much hassle for most of us.

  • Registered Users Posts: 7,905 ✭✭✭cletus

    This exactly. The EU stipulates a two year minimum warranty, and allows for individual countries to apply their own longer windows.

    Ireland has a 6 year window (with some caveats), so definitely worth pursuing.

    I just won an argument with Amazon about a defective product that was outside their limited 1 year warranty. When they say it doesn't affect your statutory rights, what they're saying is the law of the land trumps what they are offering

  • Registered Users Posts: 8,220 ✭✭✭07Lapierre

    Cranks snapping is not new. check out Laurent Fignon’s crash:

  • Registered Users Posts: 2,281 ✭✭✭Mercian Pro

    An update on the saga of my dealings with Madison UK on the issue of replacing an out of warranty failed crank. After finding a friendly bike shop with a Madison account, a warranty claim for replacement of the crankset was lodged. Following a lot of toing and froing with different people in Madison's warranty department taking less helpful positions than the guy I originally dealt with, I was asked a few weeks ago to post the broken part to them (originally photos would do). I am told that once received, the shop will get a replacement part or a credit note. I'm opting for the latter as I replaced the crank with a 105 version a long time ago. Looking forward to buying replacement front and back derailleurs once the credit note arrives.

  • Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 48,646 CMod ✭✭✭✭magicbastarder

    how old was the crank when it failed?

  • Registered Users Posts: 1,492 ✭✭✭hesker

  • Registered Users Posts: 6,208 ✭✭✭DaveyDave

    Regarding the 6 year warranty in Ireland, I believe it's subject to cost/reasonable expectation. If you buy a cheapo €300 TV from Aldi it's not expected to last 6 years. If my €2,000 Samsung broke within those 6 years it's a different story.

    Ultegra parts are high end, it's not acceptable that they're no longer covered outside of a 2 year window.

  • Registered Users Posts: 7,905 ✭✭✭cletus

    Correct. As I said, there's caveats, one of which is that you may be required to have an engineer/specialist create a report outlining that the fault was not user caused

  • Registered Users Posts: 2,281 ✭✭✭Mercian Pro

    About five and a half years. I contacted them initially to complain that the crank was not fit for purpose and needed to redesigned and was quite surprised that they offered to treat it as a warranty matter. I had seen one other reference on-line to them covering a failed crank beyond the 2 year warranty period and lots complaining that they wouldn't so I may just have been lucky with the guy who opened my email.

  • Registered Users Posts: 2,684 ✭✭✭triggermortis

    I'm a member of this club also. My crank was about 5 years old with mainly dry weather use when it started creaking badly. It didn't get to the fully snapped stage as it had just started to debond so I replaced it. Wishbone Ash gave me a replacement (thanks again!) and I later replaced that with a 8000m series Ultegra one which I hope will last a bit longer. Didn't do much about warranty apart from contacting Rose who told me I was over the 2 year warranty period.

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  • Registered Users Posts: 166 ✭✭pairofpears

    I have an R8000 53/39 172.5mm crankset going if you didnt get sorted?.

  • Registered Users Posts: 937 ✭✭✭Luxman

    I didn't want to open a new thread, but I have been listening to a creaking crank arm too, on close inspection today I can see it cracking so want to replace it, however I only want the crank arm, not the chainrings. Stumped if I can locate one online. Any ideas? Its the old 6800 Ultegra one that's on the way out, happy to replace it with 105 or Ultegra.