Can I fix this with duct tape?
07-07-20, 08:49 AM
#1
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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
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
07-07-20, 08:52 AM
#2
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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.
07-07-20, 08:52 AM
#3
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I'd send that into Shimano and see what they'll do for you.
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07-07-20, 08:56 AM
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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.
07-07-20, 09:31 AM
#5
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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...
07-07-20, 09:33 AM
#6
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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.
I like the Gorilla glue idea.
07-07-20, 09:36 AM
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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
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
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..
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.
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.
07-07-20, 09:47 AM
#9
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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.
07-07-20, 09:48 AM
#10
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Check with Shimano. They were pretty interested about such failures a short while ago.
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07-07-20, 09:53 AM
#12
Non omnino gravis
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...
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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07-07-20, 10:46 AM
#15
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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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07-07-20, 10:48 AM
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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.
07-07-20, 11:06 AM
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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..
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...
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...
Last edited by eduskator; 07-07-20 at 11:20 AM.
07-07-20, 11:42 AM
#21
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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!
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!
07-07-20, 11:46 AM
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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.
07-07-20, 12:07 PM
#23
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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.
https://www.aliexpress.com/item/3306...archweb201603_
Think it's real? I doubt it.
07-07-20, 12:12 PM
#24
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07-07-20, 12:37 PM
#25
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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.
https://www.aliexpress.com/item/3306...archweb201603_
Think it's real? I doubt it.