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PostPosted: Fri Dec 23, 2016 9:59 pm 
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Location: Drenthe, Holland
I've seen it with a ultegra crank as well.

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PostPosted: Fri Dec 23, 2016 10:15 pm 
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I thought there would be screws holding the two halves together in addition to the adhesive...


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Posted: Fri Dec 23, 2016 10:15 pm 


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PostPosted: Fri Dec 23, 2016 10:43 pm 
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Location: Canada
dynaserve wrote:
Calnago wrote:
It's just cosmetic.

Bit more than cosmetic, but luckily the failure mode is ideal to simply Loctite it back in place.

Duct tape.....
victorduraace wrote:
Must be something in glue/bonding method susceptible to failure in wet and hot conditions



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PostPosted: Fri Dec 23, 2016 10:55 pm 
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JB Weld.

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PostPosted: Sat Jan 14, 2017 12:52 am 
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http://www.bikeradar.com/forums/viewtop ... t=13064693

https://carlinthecyclist.com/2016/09/13 ... eed-crank/

Ultegra 6800 goopy commander jank finishing
Image

DA 9000 clean machining
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PostPosted: Sat Jan 14, 2017 2:05 pm 
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Ah, so that explains why the 11 speed groups are so inexpensive. Instead of welding, they glued their cranks together.


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PostPosted: Tue Jan 17, 2017 12:15 am 
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What am i supposed to say who just cracked a welded rim?

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PostPosted: Tue Jan 17, 2017 9:54 pm 
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This happened to my DA9000 Crankset. And no, it had nothing to do with the Pioneer

https://instagram.com/p/BEWuJjnLPnz/


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PostPosted: Tue Jan 17, 2017 11:33 pm 
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My buddies ultegra crank did this just a couple months ago. Didn't fully choke apart but was just about to let loose.


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PostPosted: Tue Jan 17, 2017 11:55 pm 
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Double post


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PostPosted: Sun Jan 22, 2017 11:47 pm 
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This just came into the shop today.

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PostPosted: Sun Jan 22, 2017 11:59 pm 
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I had a duraace 9000 crankset fail. No power meter.

Seems like the epoxy that holds the crank together.

Took off from the light, heard a crack, and noticed a whole lot of flex through the crank.

It didn't separate completely though, but I imagine had I put some power through it at the time it would have.


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PostPosted: Mon Jan 23, 2017 1:01 pm 
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It seems this is due to corrosion, humidity and salt?
Perhaps in conjunction with a twisting load when we pedal it work itself off or in some cases crack?

So Shimano Hollow Technology is bascially a U-profile with a reversed U-profile glued on?

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PostPosted: Mon Jan 23, 2017 1:17 pm 
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Location: Palm Coast, Fl.
Interesting you say failure due to salt.... I had a highend mtn bike bullseye rimset hand built and they lasted 15 years with zero problems until I moved to Florida... After that the flange on the rear hub cracked and failed....After which I come to find out that Bullseye had a small clause about salt weather on the hubs and failure if they were exposed too long in such climates.... :noidea:


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PostPosted: Mon Jan 23, 2017 1:44 pm 
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Joined: Fri Jul 28, 2006 8:28 pm
Posts: 89
Location: the Netherlands
Hi there,

Hollowtech is a hollow forged crank.
Hollowbond is a crank made of two hollow shells bonded together.

DA9000, DA9100, Ul6800 and XTRM9000Race are Hollowbond, all other cranks are, to my knowledge, Hollowtech.


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Posted: Mon Jan 23, 2017 1:44 pm 


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