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PSA Check your older 6700 Chains

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PSA Check your older 6700 Chains

Old 02-11-11, 12:24 PM
  #26  
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Originally Posted by Namenda View Post
So I checked out my chain, and what do I find? Thanks again to BeeSeeBee for the link above. I now have a 5600 chain on, and this 6700 chain will go to the trash can.

Wow. I would call Shimano and give them Sh** about this. Maybe ask for a free chain (another model). Amazing. It seems that in trying to make "light weight" chains these guys have compromised safety.
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Old 02-11-11, 01:53 PM
  #27  
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Ditto on mine too. Fortunatly I changed it after 1600 miles but saved it for whatever reason and after seeing this board inspected it.... and wala cracked. I replaced it in Nov 2010 so hoping the new 6700 I replaced it with has and updated chain. Lucky I changed it when I did. I'll certainly keep a close eye on the new one.
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Old 02-11-11, 03:34 PM
  #28  
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Originally Posted by rick1 View Post
Ditto on mine too. Fortunatly I changed it after 1600 miles but saved it for whatever reason and after seeing this board inspected it.... and wala cracked. I replaced it in Nov 2010 so hoping the new 6700 I replaced it with has and updated chain. Lucky I changed it when I did. I'll certainly keep a close eye on the new one.
Would seem to be more than just an occasional issue.... Replacing the old 6700 today with a 6600.... Bike should be back up and running today...
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Old 02-11-11, 03:35 PM
  #29  
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i recently broke my 105 chain but it sheered clean off. luckly when mine broke it didnt trash anything else but did chip some paint on the frame.
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Old 02-12-11, 07:38 AM
  #30  
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Originally Posted by Excelsius View Post
Wow. I would call Shimano and give them Sh** about this. Maybe ask for a free chain (another model). Amazing. It seems that in trying to make "light weight" chains these guys have compromised safety.
Well, in my case, it didn't go any further than what you see in the picture. Had it broken while riding, I would likely be a bit more perturbed. Fortunately, I had a spare chain to put on, so I won't miss any riding time over this. Also, as I bought the 6700 chain from a Performance Bike in California while on vacation, I can't really return it. Still have the receipt, though.

I've used other lightweight chains in the past, and never had a problem like this. I may go back to a SRAM 1090R chain, as I had really good luck with them in the past, and they lasted a good long time for me, too. Or maybe a KMC, or Wipperman. Haven't tried those yet...
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Old 02-12-11, 08:01 AM
  #31  
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So is there a way to check if a chain is a 6700? How old are the chains people have had problems with?
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Old 02-12-11, 08:21 AM
  #32  
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My LBS had a bad batch of 6700 chains come through last year. Nearly every chain in that groups developed the cracks in the plates or broke outright. Shimano replaced them all with DA7800 chains. (like 10 chains).
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Old 02-12-11, 08:27 AM
  #33  
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I was planning on switching my Ultegra chain for a KMC x10SL mainly as part of a WW project. Looks like I'll speed up the timetable on that for more practical reasons.
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Old 02-12-11, 08:33 AM
  #34  
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Just examined my Ultegra 6700 chain with 700 miles, no cracks. Bike was manufactured in May 2010.
I will have to examine it after every ride now, if I see even 1 small crack I will replace it with a SRAM chain. Might just replace it anyway before any cracks develop.
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Old 02-12-11, 08:42 AM
  #35  
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Originally Posted by Excelsius View Post
Wow. I would call Shimano and give them Sh** about this. Maybe ask for a free chain (another model). Amazing. It seems that in trying to make "light weight" chains these guys have compromised safety.
The KMC X10SL is one of the lightest chains around. I've used them for thousands of miles without issue. Great chain.
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Old 02-14-11, 05:32 PM
  #36  
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So any others have problems that haven't chimed in?
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Old 02-14-11, 05:36 PM
  #37  
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I just checked mine. It has about 4000 miles on it and is close to its end of life anyway. It looks fine, no cracks.

I do have 3 more fresh 6700 chains (still new in box), is there any way to know which ones are vulnerable and which ones are ok??
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Old 02-14-11, 05:39 PM
  #38  
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Jebus I'll be checking mine tonight - I already have a date with the bike to clean and lube chain, take off cassette and clean cogs.
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Old 02-14-11, 05:42 PM
  #39  
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Originally Posted by stien View Post
Jebus I'll be checking mine tonight - I already have a date with the bike to clean and lube chain, take off cassette and clean cogs.
Is this your Valentine's Day Date?!?
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Old 02-14-11, 05:44 PM
  #40  
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Originally Posted by datlas View Post
I just checked mine. It has about 4000 miles on it and is close to its end of life anyway. It looks fine, no cracks.

I do have 3 more fresh 6700 chains (still new in box), is there any way to know which ones are vulnerable and which ones are ok??
All I've been able to glean from other posters is older 6700 chains.... Wish someone had a series number or batch number to stay away from. It bothers me enough that the chain I replaced it with was the old 6600 version.
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Old 02-14-11, 05:44 PM
  #41  
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Originally Posted by datlas View Post
Is this your Valentine's Day Date?!?
Yep! That I'm actually pleased about. Something about cleaning my bicycle that just calms me down, ya know?



But really I've ridden my bike 6/7 of the last days, the drivetrain needs love.
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Old 02-14-11, 06:01 PM
  #42  
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Wow, very concerning news. I've got the same bike and groupset so I'll have to check my chain once I get home. I clean and lube the chain every other ride and so far I haven't noticed any cracks.
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Old 02-14-11, 06:36 PM
  #43  
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Originally Posted by Namenda View Post
Thanks for the link.
I see what you did there.
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Old 02-14-11, 06:37 PM
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It all breaks weenies. Just because your 6700 chain broke doesn't mean they are inherently defective.
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Old 02-14-11, 10:10 PM
  #45  
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I can imagine peoples' chains cracking maybe once per chain, but all those cracks per chain? Sheesh. I've got two 6700 chains right now, one on a bike and another in its box. I won't be back in town until late March, but I'm going to try to remember to take a good look at them when I get home. Maybe I'll make a side run to get some other chains.
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Old 02-15-11, 12:11 PM
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Originally Posted by kayakdiver View Post
So any others have problems that haven't chimed in?

I had the same problem last March 2010. It made me not trust the new 6700 Ultegra chains. I found lesser evidence of this with DuraAce 7900 chains. I switched to DuraAce 7801s. Last time I posted about this, I caught a raft of shyte for cleaning habits, etc., so I shut up and just used the 7801s (and didn't change a thing about how I cleaned my chain when the time called for it):

https://bimactive.com/ba/journal/post/10783/30590


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Old 02-15-11, 12:31 PM
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Originally Posted by kayakdiver View Post
It bothers me enough that the chain I replaced it with was the old 6600 version.
why?
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Old 02-15-11, 12:32 PM
  #48  
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Originally Posted by Homebrew01 View Post
No, it was evolution
Side of chain plate bends out, deraileur hanger breaks off... YOU CANT EXPLAIN THAT!
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Old 02-15-11, 12:55 PM
  #49  
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holy mama! thanks for the heads up. will check.
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Old 02-15-11, 12:55 PM
  #50  
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Originally Posted by Excelsius View Post
Wow. I would call Shimano and give them Sh** about this. Maybe ask for a free chain (another model). Amazing. It seems that in trying to make "light weight" chains these guys have compromised safety.
It's not a problem with "light weight chains" The reason you're seeing cracked sideplates on 10/11speed chains is due to how they are made. In order to make the chain thin enough to work with the tight spacing of 10/11 speed cassettes, they have to thin the sideplates. All 10speed chains have this problem, it's why campy and shimano don't use quicklinks, and it's why you shouldn't ever remove a 10/11speed chain for cleaning. You just got a 10 speed bike and are already an expert, sheesh.
Hell, I have seen chainsaw chains snap side links, which is much scarier.

Last edited by clink83; 02-15-11 at 01:01 PM.
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