Is this normal for an Ultegra crank?
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Is this normal for an Ultegra crank?
Was riding along, felt a shudder as I dialed it up.
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Were the crankbolts not torqued? Or does the break trace to the hollowing of the spider? Trying to see what exactly failed.
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That'll buff right out.
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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.
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I just saw another picture like this, also of an Ultegra crank from 2015, I think.
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This happens way more than one would expect with the 6800 cranks. I've seen 3 in the past few years myself and of the 100 or so people I follow on strava 2 have had theirs do the same thing mid ride.
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I only saw one rider the others were just bikes. He was a normal looking cyclist. Probably 160-170. Guys online are probably the same, I don't know them personally just follow them as we live in the same city.
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@Jiggle, what year is your crank from?
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170lb rider, 2017 model. If it's glued together I can just glue it back, right? What do you think of JB Weld?
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Well Shimano obviously can't get it right. JB Weld is an American company, and it has been used to hold engine blocks together. I think it can handle a little bike crankset. Just shooting from the hip here, but I think this plan has a chance.
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Seek official warranty service first....resort to last-ditch duct-tape measures last.
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Yes, JB Weld is a great product, but if you don't apply it correctly or it fails for some other reason, you are at fault.
I'm sure Shimano will replace it, so i guess you lost confidence in their ability to manufacture a defect free product and will never buy any of their products in the future.
Maybe you should look at Sram.
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If this failure worries you, do some research into product failures of the big 3 manufacturers.
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I had a Shimano 6800 crank fail at the spider - cracking - and have seen several others. It is either a design flaw, or a manufacturing flaw and they should cover it under warranty.....
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