Is this normal for an Ultegra crank?
05-30-18, 05:58 PM
#27
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05-30-18, 06:04 PM
#28
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I concur. This photo looks like one I saw a few weeks ago, but I could be wrong.
The fact is, there have been some failures, but unless someone can document the exact failure rate, I'll treat this the same way the SRAM fanboys treat my comments about SRAM.
The fact is, there have been some failures, but unless someone can document the exact failure rate, I'll treat this the same way the SRAM fanboys treat my comments about SRAM.
05-30-18, 06:28 PM
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OUCH... I resemble that remark.
05-30-18, 08:12 PM
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Be sure to wear a helmet cam and post the crash when you're climbing out of the saddle.
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05-30-18, 08:58 PM
#32
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I would try JB Weld and put a hose clamp around each arm of the crank spider. There is nothing to loose by trying.
This would not have happened with 1x.
This would not have happened with 1x.
05-30-18, 09:08 PM
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I'm all for fixing things, but gotta draw the line at personal safety.
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05-30-18, 10:31 PM
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05-30-18, 10:40 PM
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The same thing happened to a friend last month. Shimano replaced it under warranty. Take it to your shop and let them handle it.
05-31-18, 12:39 AM
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I have a 6800 crank and am a little concerned.
If they keep breaking like this, surely Shimano should do a recall, as clearly they are not fit for purpose. I don't want to have to wait until I am miles from anywhere to have it break and therefore worthy of replacement.
If they keep breaking like this, surely Shimano should do a recall, as clearly they are not fit for purpose. I don't want to have to wait until I am miles from anywhere to have it break and therefore worthy of replacement.
05-31-18, 12:50 AM
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+1
What he said. They are bonded. Used to see a lot of these in an LBS I worked in. Your LBS can get it fixed under warranty, but its up to your LBS to determine if they will charge labor.
Yes. This isn't the first time I've seen something like this on the internet. I asked a mechanic online about it and he said he's only seen it with Ultegra 6800 and Duraace 9000 cranks. The two parts of the crank are bonded together and it looks like that has failed. You can try to get it fixed under warranty but I don't know if they will replace like with like. If they did I'd be worried that they fixed the problem in manufacturing. Personally I would replace with another crankset that isn't 6800 or 9000.
05-31-18, 01:27 AM
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@Jiggle You've been complaining about Shimano bonded cranks for over a year.
$1007 for Ultegra 8000??
In this thread you claimed that you would only buy a bonded crankset if it was carbon fiber.
When are new 105 and Ultegra due?
What happened between February of 2017, and June of 2017? You sounded pretty set against buying one last year, but apparently you bought one anyway? Your story smells a little fishy.
$1007 for Ultegra 8000??
In this thread you claimed that you would only buy a bonded crankset if it was carbon fiber.
When are new 105 and Ultegra due?
What happened between February of 2017, and June of 2017? You sounded pretty set against buying one last year, but apparently you bought one anyway? Your story smells a little fishy.
05-31-18, 01:34 AM
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noodle old chap, people change their minds, happens all the time. Insinuations like yours are simply unnecessary.
05-31-18, 02:13 AM
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I was a bit surprised, when I first saw a FC-9000, that Shimano had opted for bonded construction; it's obviously a bit of a shortcut compared to previous, more ingenious methods of hollow crank construction.
But I figured Shimano know what they're doing; this must be good enough. Apparently not.
But I figured Shimano know what they're doing; this must be good enough. Apparently not.
05-31-18, 08:42 AM
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05-31-18, 12:07 PM
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05-31-18, 02:00 PM
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I've avoided the funky new 4 arm spiders. 
One thought I had, however... I believe the new "shadow" features may give the rear derailleur some protection from becoming overstretched if one has a short chain and pops it up to a big/big combo.
I am running a short chain on one bike due to build reasons. I'm pretty careful about avoiding the big/big, but did bump the derailleur up to it once. The chain didn't hop onto the larger sprocket, and I shifted back quickly.
Anyway, if the chain did hop up, and the rider didn't stop pedaling, but rather proceeded to mash on the cranks, then something would have to fail, and I could imagine tearing apart the cranks. Or, perhaps damaging them with immediately realizing it.
One thought I had, however... I believe the new "shadow" features may give the rear derailleur some protection from becoming overstretched if one has a short chain and pops it up to a big/big combo.
I am running a short chain on one bike due to build reasons. I'm pretty careful about avoiding the big/big, but did bump the derailleur up to it once. The chain didn't hop onto the larger sprocket, and I shifted back quickly.
Anyway, if the chain did hop up, and the rider didn't stop pedaling, but rather proceeded to mash on the cranks, then something would have to fail, and I could imagine tearing apart the cranks. Or, perhaps damaging them with immediately realizing it.
05-31-18, 02:14 PM
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No doubt Shimano has had some failures with this design, but I doubt his JRA story.
06-01-18, 04:02 AM
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Unnecessarily suspicious, I hope you mean. People can change their minds, you know, and I for one am glad he brought this up. I have one of these cranks, and didn’t even know it was bonded. We should be thanking, not criticising the man.
06-01-18, 05:26 AM
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Then I feel sorry for you. Me, I’m glad I know so I can keep an eye on a critical piece of gear.
You have Ultegra gear, too ?
You have Ultegra gear, too ?