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

  • 23-03-2022 8:25pm
    Registered Users Posts: 8

    Hi everyone,

    Just wondering if anyone out there has a similar crank arm or crank set for sale (new or used) that would suit my bike {Shimano Ultegra 6800 Crank arm (53-39 172.5)}? .Photos attached.

    I was out for the first spin of the year today and snapped the crank arm. Weather is looking great for the weekend so I'd love to get out for it. Any help much appreciated. I'm based in Waterford.

    Thanks a mil!




  • Registered Users Posts: 16,449 ✭✭✭✭dahat

    52/36 one here with chainrings but no bolts or non drive side crank.

    Based in S.Tipp

  • Registered Users Posts: 5,738 ✭✭✭fat bloke

    Snap! Literally. Only 20 mins ago got a whatsapp from a mate - exact same issue with an ultegra crank today.

    There's a fair bit about it on the web with shimano hollowgram / hollowtech cranks. It's not uncommon.

  • Registered Users Posts: 841 ✭✭✭nicksnikita

    Weird. Could be the change in the weather

  • Registered Users Posts: 8 buckmulligan

    Thanks Dahat. Do you reckon it would work?

  • Registered Users Posts: 8 buckmulligan

    Thanks Fat Bloke. I don’t really know if I should buy the same one again; maybe it’s a flaw in the design. Any recommendations for something else?

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  • Registered Users Posts: 8 buckmulligan

    More likely the stone and a half I put on in 6 months 😆

  • Registered Users Posts: 16,449 ✭✭✭✭dahat

    Not a clue tbh.

    53/39 could be a different bcd to 52/36 but just offered up a possible solution for you.

  • Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 47,449 CMod ✭✭✭✭magicbastarder

    sure didn't WA and Mercian Pro both snap ultegra cranks on the same ride?

  • Registered Users Posts: 407 ✭✭gmacww

    Not unusual at all for the 6800 model. Have a quick search and you’ll find plenty of reports. R8000 doesn’t seem to have the same issue. I’ve heard of a few cases locally and all were replaced out of warranty so maybe try to engage with a local dealer.

  • Registered Users Posts: 1,616 ✭✭✭TheDocMan

    Same BCD (110mm) and will work fine once it's 172.5mm. You transfer youre rings 53/39 and bolts straight over with no front mech adjustment needed.

    Note if you're not super powerful and maybe not a frequent cyclist I'd consider using 52/36 rings. May need to drop front mech slightly and adjust front gear cable then though

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  • Registered Users Posts: 5,738 ✭✭✭fat bloke

    Yeah, I dunno, I've two bikes at home on 6800 and I've had a lot of bikes before that with the same crank and no issues so it certainly wouldn't put me off. There's sram, rotor, fsa as well, though I don't know much about rotor myself. In the current climate it's more about what you can get in stock and what's not overpriced. If you don't mind the label downgrade then 105 is an easy solution too.

  • Registered Users Posts: 2,670 ✭✭✭triggermortis

    Same happened to mine! WA helped me out with a replacement. Just a note, if you go with a R8000 replacement the chain rings won't swap over