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Old 03-03-11, 12:06 AM   #1
JustMe
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Mega thanks to budget pro bike for . . .

going the extra distance to resolve an issue with Trek and Shimano that resulted from a chain break that broke the frame of a 2010 Madone Six Series Project One bike I bought a year earlier. Trek could have probably repaired the frame, which broke, at the drive side dropout, when the inside plate of a Shimano 6700 series chain fractured, separated from the link pin, hooked the derailleur cage, and pulled the rear derailleur backward while heading up a 12%+ grade.







Had it not been for a second 6700 chain breaking about a week later, I may not have given it a lot of thought, and been satisfied with Trek’s repair of the frame. But two chains within two weeks seemed unusual enough to warrant a little research. Thanks to some information received from another forum member on the east coast, and a few hours of searching the internet, it became apparent that Shimano had been aware of a problem with their 6700 series chains for almost a year, but refused to acknowledge any defect in the design or manufacturing process as indicated by the following article.

http://cozybeehive.blogspot.com/2010...n-failure.html

I must admit that when I first took the bike into Oscar at Budget Bike, I was at a loss for an explanation of what caused the damage, and Oscar expressed some reluctance to believe that the damage wasn’t the result of some abuse. Fortunately I had photographed the damage immediately after it occurred. During the following week, the boys at Budget had disassembled the bike in anticipation of forwarding the frame to Trek for evaluation. I experienced the second chain brake on another bike equipped with the same chain, and started to question the integrity of Shimano’s 6700 chains. I had an epiphany. The next day I described what I had discovered to Oscar, and the puzzle of how the damage was caused became apparent. Oscar had the frame delivered to Trek for evaluation, and Dave picked up the ball as liaison. That was early January.

Since Shimano had been aware of the problem with their 6700 chains for almost a year, and failed to issue any sort of recall or public notice of the potential problem which could result in damage, or in a given circumstance even injury, this seemed an appropriate situation for Shimano to pick up the tab on a new frame. Thanks to Dave’s persistence and negotiation, and Oscar’s patience and willingness to go beyond the call of duty for his customers, Trek delivered a new 2011 Series Six Project One frame set, and rear derailleur last week. Budget Pro Bike on Colorado Blvd., in Eagle Rock, gets my sincere thanks and confidence for their customer service.
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Old 03-03-11, 12:23 AM   #2
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I broke a 6700 chain just last month, climbing a 12% grade as well. The chain break looked just like yours, but fortunately no damage was done to the bicycle. I patched it up with a chainbreaker+sparelink I carried with me in my seatbag and continued on (and have ridden on it another 500 mi since then), but after seeing this I think it's safest that I simply replace the chain.

I had no idea a broken chain could take out a whole frame like that.

Props to Budget Pro Bike, as well as Trek.

PS, as for a build date on my chain, my bike is a 2010 testbike so it was probably built late 2009.

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Old 03-03-11, 01:17 AM   #3
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This bike was also built in late 2009, and there is some suggestion that Shimano had a bad batch of 6700 chains made in 2009 that have been the root of the problem. They are now marketing a revised chain under the designation CN-6701. I have not seen any indication that the 7900 (Dura Ace) chain has had similar problems, but Shimano has also changed the designation on the Dura Ace chain. If you read through the comments posted to the blog that I linked to, you'll find other reports of fairly significant damage resulting from these chains breaking. Save yourself the inconvenience of potential damage.
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Old 03-03-11, 11:11 AM   #4
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This bike was also built in late 2009, and there is some suggestion that Shimano had a bad batch of 6700 chains made in 2009 that have been the root of the problem. They are now marketing a revised chain under the designation CN-6701. I have not seen any indication that the 7900 (Dura Ace) chain has had similar problems, but Shimano has also changed the designation on the Dura Ace chain. If you read through the comments posted to the blog that I linked to, you'll find other reports of fairly significant damage resulting from these chains breaking. Save yourself the inconvenience of potential damage.
Also documented HERE.
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Old 03-03-11, 11:46 AM   #5
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Thanks for linking that Bobsled. The more people made aware of this situation, the better.
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Old 03-03-11, 01:53 PM   #6
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Holy crap. I'd never expect a broken chain to do that much damage. It's like the perfect storm.
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Old 03-03-11, 02:20 PM   #7
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Wow, that's a hell of a nice bike for that to eff up.
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Old 03-03-11, 04:44 PM   #8
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Thanks for linking that Bobsled. The more people made aware of this situation, the better.
You're welcome.
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Old 03-03-11, 10:16 PM   #9
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If you have an issue with the chain you should file a report with the Consumer Product Safety Commission. Use the "Report an Unsafe Product" link on the right.

Federal law requires that manufacturers, distributors, and retailers immediately (i.e., within 24 hours) report to the CPSC information that a product contains a defect which could create a substantial product hazard, or pose a risk of injury or death to consumers. If enough people report the defective chains, Shimano will be forced to do a recall and prove they have fixed the defect. And they could get a hefty fine for not fixing it when they first found out about it.
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Old 03-04-11, 06:09 PM   #10
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I wouldn't waste my time waiting around for a government consumer protection agency to gather information, and impose a fine that doesn't do a thing to replace the consumer's loss. If you want to impose an economic sanction for a design or manufacturing defect, use the cvil justice system, and put together a case for punitive damages.

Next best recourse is to inform as many potential users of the product as possible and exercise the consumer prerogative to NOT BUY the product so that the consumer isn't put at risk, and the manufacturer/distributor is deprived of the revenue derived from the potential sale of a defective product.

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Old 03-05-11, 09:08 AM   #11
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Wow! Thanks for the heads up...
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