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Can I fix this with duct tape?

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Can I fix this with duct tape?

Old 07-07-20, 08:49 AM
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hammond9705
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Can I fix this with duct tape?

I was JRA on flat ground this morning and this happened







Its an Ultegra crank with only about 5500 miles. I admit I am a heavy rider, but I still think I should have gotten more then 5500 miles out of it. The crank had felt funny the last few days, but I thought it was an old cleat and replaced it. Guess I should have looked closer. I was fortunate that I was on flat ground and not pushing hard so I didn’t fall when it broke
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Old 07-07-20, 08:52 AM
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WhyFi
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This is actually not a terribly uncommon occurrence with these bonded Shimano cranks. I would check with the shop where you got it and see if they can do anything - there's a good chance that they can't/won't, but it's worth stopping in or making a phone call.
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Old 07-07-20, 08:52 AM
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I'd send that into Shimano and see what they'll do for you.
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Old 07-07-20, 08:56 AM
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rubiksoval
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That's absolutely nuts. I'd definitely send that to Shimano. Wow, so much bad stuff could have happened there. Glad you were unscathed.
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Old 07-07-20, 09:31 AM
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ririder
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whoa! That could have ended badly. As far as duct tape??? I would opt for gorilla glue instead or maybe flex seal...
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Old 07-07-20, 09:33 AM
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Pretty bad and glad you weren't sprinting or something, but yeah, it happens. I broke a Nuovo Record crank BITD due to crevice corrosion in a small scratch, which invisibly ate halfway through the arm. If stuff never broke it would be too heavy.

I like the Gorilla glue idea.
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Old 07-07-20, 09:36 AM
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Originally Posted by hammond9705 View Post
I was JRA on flat ground this morning and this happened







Its an Ultegra crank with only about 5500 miles. I admit I am a heavy rider, but I still think I should have gotten more then 5500 miles out of it. The crank had felt funny the last few days, but I thought it was an old cleat and replaced it. Guess I should have looked closer. I was fortunate that I was on flat ground and not pushing hard so I didn’t fall when it broke
When was the bike purchased? Ultegra has a 1 year warranty against manufacturers defects.

Originally Posted by WhyFi View Post
This is actually not a terribly uncommon occurrence with these bonded Shimano cranks. I would check with the shop where you got it and see if they can do anything - there's a good chance that they can't/won't, but it's worth stopping in or making a phone call.
I've seen dozens of photos like these, but have yet to see one in person

Originally Posted by mac_flyer9 View Post
I'd send that into Shimano and see what they'll do for you.
Originally Posted by rubiksoval View Post
That's absolutely nuts. I'd definitely send that to Shimano. Wow, so much bad stuff could have happened there. Glad you were unscathed.
What's nuts is that this is a known flaw, but Shimano hasn't fixed the issue. I believe it's still happening to 8000/9100 series cranksets..
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Old 07-07-20, 09:45 AM
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Try to warranty it even if you are beyond the 1 year mark. I've read others have had Shimano cover this even when out of warranty.

Do you live in a damp, humid climate? There is a theory and some anecdotal evidence that moisture collects inside the bonded arms causing oxidation that eventually leads to failure. Was there a white powdery substance inside the arms?

Luckily, you weren't climbing or sprinting when this happen which can lead to a catastrophic crash.
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Old 07-07-20, 09:47 AM
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hammond9705
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It’s on a frame I bought on eBay and then built. The crankset was bought from Amazon in Feb 2015.
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Old 07-07-20, 09:48 AM
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Check with Shimano. They were pretty interested about such failures a short while ago.
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Old 07-07-20, 09:49 AM
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Originally Posted by MoAlpha View Post
I like the Gorilla glue idea.
J-B Weld it.
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Old 07-07-20, 09:53 AM
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This was not presented in the correct Bike Forums Format. Just riding along? No, no no. You were slamdancing on the pedals, just about to drope the hamer, when the force of your massive guads blew the crank apart. Now you've got a story.

I would hang it over the mantle, and every time I told the story about it breaking, it would get more fantastical. So I was racing against unsuspecting planes down at the airport...
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Old 07-07-20, 09:55 AM
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Originally Posted by hammond9705 View Post
It’s on a frame I bought on eBay and then built. The crankset was bought from Amazon in Feb 2015.
Also possible that it is a counterfeit. Not unheard of on Amazon for sure.
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Old 07-07-20, 10:05 AM
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noodle soup
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Originally Posted by Ogsarg View Post
Also possible that it is a counterfeit. Not unheard of on Amazon for sure.
Highly unlikely. High-end carbon fiber framesets are counterfeited because of the insane markup that's possible. It's not cost-effective to do that on a crankset that might sell for $150.
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Old 07-07-20, 10:46 AM
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I have a thread somewhere here where that happened to my wife. I wrapped it with dacron cord and coated with epoxy for one more ride until the new arm came.
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Old 07-07-20, 10:48 AM
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Ogsarg
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Originally Posted by noodle soup View Post
Highly unlikely. High-end carbon fiber framesets are counterfeited because of the insane markup that's possible. It's not cost-effective to do that on a crankset that might sell for $150.
Plenty of counterfeits of things that sell for a whole lot less. Cleats are a great example.

A friend of mine who travels to China extensively said that knock-offs of virtually anything with a popular brand name on it are available if you know where to look.
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Old 07-07-20, 11:06 AM
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Originally Posted by Ogsarg View Post
Plenty of counterfeits of things that sell for a whole lot less. Cleats are a great example.
The cost of the manufacturing equipment for a 6800 crankset, is far greater than that of a molded piece of plastic. A counterfeiter is also likley to sell 100x as many cleats because it's a high wear item..
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Old 07-07-20, 11:15 AM
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Gorilla glue should do the trick

Hope you didn't get injured when it snapped. These can lead to serious injury pretty quickly.

Saw a guy last weekend snapping his right pedal when climbing. He had to pedal all the way back down to the parking (20kms away from where he was) with only 1 foot because the national park is closed to motorized vehicles right now...

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Old 07-07-20, 11:26 AM
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At least this wasn't a Carbon Crank and it would start the whole don't trust carbon thing all over again.
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Old 07-07-20, 11:32 AM
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Originally Posted by velopig View Post
At least this wasn't a Carbon Crank and it would start the whole don't trust carbon thing all over again.
Don't get me started on CF steerer tubes & OEM compression plugs!
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Old 07-07-20, 11:42 AM
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Typical asian junk. Never happens with Campagnolo.

Anyway, fashion a piece of ipe to fit inside the hollows, glue it in place with construction adhesive, sink some screws from the outside, reassemble - good as new!
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Old 07-07-20, 11:46 AM
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Originally Posted by noodle soup View Post
The cost of the manufacturing equipment for a 6800 crankset, is far greater than that of a molded piece of plastic. A counterfeiter is also likley to sell 100x as many cleats because it's a high wear item..
https://www.bicycling.com/bikes-gear...ake-bike-gear/

I think you underestimate how easy it is to knock stuff off. Even stuff that is relatively obscure. Frames, wheels, handlebars, helmets, and on and on.

Example of an Ultegra crankset with bottom bracket for $175.00.
https://www.aliexpress.com/item/3306...archweb201603_

Think it's real? I doubt it.
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Old 07-07-20, 12:07 PM
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Originally Posted by Ogsarg View Post
I think you underestimate how easy it is to knock stuff off. Even stuff that is relatively obscure. Frames, wheels, handlebars, helmets, and on and on.
I see no mention of groupsets in there. CF manufacturing of frames, rims, and handlebars is a relatively simple process

Originally Posted by Ogsarg View Post
Example of an Ultegra crankset with bottom bracket for $175.00.
https://www.aliexpress.com/item/3306...archweb201603_

Think it's real? I doubt it.
I think you underestimate the cost of manufacturing complex mechanical components.
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Old 07-07-20, 12:12 PM
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Originally Posted by sced View Post
Typical asian junk. Never happens with Campagnolo.


Busted Carbon: Campagnolo Chorus Carbon Crankset
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Old 07-07-20, 12:37 PM
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Originally Posted by Ogsarg View Post
Example of an Ultegra crankset with bottom bracket for $175.00.
https://www.aliexpress.com/item/3306...archweb201603_

Think it's real? I doubt it.
Merlin regularly has them for under $200 with the BB for under $20. Yeah, I do think that the product in your link is real.
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