tag:blogger.com,1999:blog-13887692.post8522869804901458996..comments2024-03-13T02:16:08.135-04:00Comments on Cozy Beehive: Update : More Shimano Ultegra Chain FailuresRon Georgehttp://www.blogger.com/profile/18394865788996482667noreply@blogger.comBlogger20125tag:blogger.com,1999:blog-13887692.post-29623319691454393142012-01-22T11:31:09.023-05:002012-01-22T11:31:09.023-05:00Ive just had an Ultegra 6700 brake after only 2 we...Ive just had an Ultegra 6700 brake after only 2 weeks and 250 miles. After a closer inspection I can see many small cracks in the side plates. I wont ever by a Shimano chain again.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-34822023858825958702011-09-29T07:36:57.590-04:002011-09-29T07:36:57.590-04:00Thanks, i was just about to order a new Ultegra ch...Thanks, i was just about to order a new Ultegra chain and i'll be getting something else! Wouldn't fancy it snapping in a sprint!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-79066137072871886182011-05-09T17:44:46.300-04:002011-05-09T17:44:46.300-04:00I just returned from LBS which diagnosed failed Ul...I just returned from LBS which diagnosed failed Ultegra chain on my 3 month old Madone 5.2. Chain did not crack as shown in images here, but side plate bulged, eventually jamming the derailleur, which snapped the hanger and rammed the whole mech up into the spokes. The back wheel locked solid and the mech scored into the chainstay, causing fatal damage to the frame. I was seated and not putting significant power through the drive chain when this happenned. I was lucky not to crash, but was only doing about 10 mph after remounting to look for cause of the skipping chain. The chain came new on the bike and had only about 500 miles on it. I have never had a chain break in 30 years of riding and had looked after this one well as it was on my - now dead - best bike. This is one of several failures seen recently by the LBS guys on Ultegra chains and by reading these posts, it seems only time until someone is seriously injured. A re-call may be required. NigelAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-1836349590809216962011-03-09T20:20:57.035-05:002011-03-09T20:20:57.035-05:00http://s72.photobucket.com/albums/i182/ditrydan/ch...http://s72.photobucket.com/albums/i182/ditrydan/chain/<br /><br />Here is pictures of mine with about 1500 miles. I lube with dumonde tec every 150 miles or so. I never degrease and just wipe the chain after lubing. This method has always worked well for me in the past. I got 4000 miles out of my last 7900 chain before it became stretched. <br />I purchased two chains when I got this one. The other is on my cyclocross bike with about 500 miles. I can't find any cracks in that one yet.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-36639238193985034912010-11-24T13:31:19.418-05:002010-11-24T13:31:19.418-05:00I also had Ultegra 6700 chain failure in April. It...I also had Ultegra 6700 chain failure in April. It was used about 3000km's and it broke in the same way as the chains in this thread.<br /><br />I contacted Shimano and they said that they acknowledge the problem and they sent me new chain that is so far working well and I haven't seen cracks in chain.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-31175614339462853522010-08-26T18:20:16.091-04:002010-08-26T18:20:16.091-04:00Update from my post yesterday. On close examinatio...Update from my post yesterday. On close examination, there are several cracks in other outer plates on my 6700 chain. My chain has broken twice since purchase on July 1 - today is August 26, 2010. I called the Shimano customer service folks and they admitted they have had a number of failures and to send it in and they will replace it. The person I spoke with attributed it to a problem with a coating process...<br />JohnAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-50592847836222569132010-08-25T22:50:20.202-04:002010-08-25T22:50:20.202-04:00Interesting...I had an outer plate break twice sin...Interesting...I had an outer plate break twice since a new Ultegra chain was put on my Felt road bike on July 1...only 1026 miles since then. First break after probably 800 miles of use. JohnAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-49260885770237671572010-06-20T10:07:47.076-04:002010-06-20T10:07:47.076-04:00Four chains...all 6700 broken. I just finished pu...Four chains...all 6700 broken. I just finished pulling out of one of the biggest races of the season due to a chain I replaced yesterday due to the cracked plate. I've replaced a rear deraiiler...what's a good alternative to that piece of crap 6700?Geoffhttp://www.macsvo2.comnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-75372662712416905702010-05-05T16:40:21.897-04:002010-05-05T16:40:21.897-04:00I have just detected several stress failures of th...I have just detected several stress failures of the same nature on a new and well maintained chain, I was totally amazed when I found them, one I could accept, a chain full is rubbish. Perhaps Shimano should be advertising these chains as single use only no more than 600Km!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-64422908872653420462010-03-17T00:55:28.929-04:002010-03-17T00:55:28.929-04:00Those have to be some of the worst maintained chai...Those have to be some of the worst maintained chains I've seen. Even if the failures weren't caused by lack of maintenance - regularly cleaning and lubing your chain might give you a chance to see a crack before riding on it again!<br /><br />Also - who the heck uses Ultegra chains? And why? The cost savings over the Dura Ace is insignificant.Chrisnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-54451047683335326462010-03-05T05:20:43.674-05:002010-03-05T05:20:43.674-05:00It's a manufacturing problem, caused by over h...It's a manufacturing problem, caused by over hardness (brittleness) of the plates and/or possibly a minutely undersized hole which increased the interferance fit beyond tolerance and over stressed the plate at the hole.<br /><br />Chain manufacturing is a straightforward process, but entails working with very tight dimensional, material, and heat treating tolerances. The trend to narrower and lighter chains narrows the working tolerances considerably, leaving almost zero margin for error. This kind of problem is likely to become more common in the future, so good QC and good vigilance by consumers is important.FBinNYhttp://www.bikeforums.net/showthread.php?625635-ALERT%21-Shimano-CN-6700-Chain-and-possibly-CN-7900noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-28160608700318802162010-03-04T16:37:44.176-05:002010-03-04T16:37:44.176-05:00maybe the cracks are engineered to help the chains...maybe the cracks are engineered to help the chains shift bettercwghttps://www.blogger.com/profile/11815585725243317055noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-38314361232019957422010-03-03T22:01:54.010-05:002010-03-03T22:01:54.010-05:00I think the Toyota comment might have some relevan...I think the Toyota comment might have some relevance. It seems to me that the Japanese business culture is to never admit a failure or problem until you have no choice. Toyota had problems in the past with engines where the oil would sludge up and as I remember they denied it until they were forced to admit it.3crossnoreply@blogger.comtag:blogger.com,1999:blog-13887692.post-73726906551625156242010-03-03T17:54:45.974-05:002010-03-03T17:54:45.974-05:00David :
Feel free to share some pics and I'll...David :<br /><br />Feel free to share some pics and I'll append it to the post. Thanks.Ron Georgehttps://www.blogger.com/profile/18394865788996482667noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-48132906207249785252010-03-03T15:45:31.747-05:002010-03-03T15:45:31.747-05:00This observation may not be related to the mention...This observation may not be related to the mentioned failures, but all these chains (and chainrings) are appallingly dirty (for having been ridden so little). I'm going to assume wet to slushy conditions. If slush, there may be salt from the road in with all that muck.Jimhttps://www.blogger.com/profile/11938379025774754317noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-78083402697338043582010-03-03T14:32:30.180-05:002010-03-03T14:32:30.180-05:00I had 2 Shimano Ultegra 6600 chains break. Thanks...I had 2 Shimano Ultegra 6600 chains break. Thanks for the post. Now I know that I'm not alone.David Kimhttps://www.blogger.com/profile/07766083112679785390noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-79801140822595542442010-03-03T13:07:29.284-05:002010-03-03T13:07:29.284-05:00Hey everyone,
Jobst Brandt had the following to s...Hey everyone,<br /><br />Jobst Brandt had the following to say when I showed him these pictures :<br /><br /><b><br /><br />"I've written about faulty heat treatment of chains over the years and recently. I had SRAM and Regina chains that cracked and broke apart around rivets. Ordinary steel stretches or<br />bends but it doesn't crack in a visually brittle mode. This is a lot like hard anodizing rims and having them crack apart... as they did massively when the ill advised use of the method was introduced by rim manufacturers. You shouldn't wonder why I say the bicycle industry is too poor to hire good engineers. There's no one in charge in the engineering department." </b>Ron Georgehttps://www.blogger.com/profile/18394865788996482667noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-49040430458212599362010-03-03T11:37:23.563-05:002010-03-03T11:37:23.563-05:00Maybe Shimano is owned by Toyota.Maybe Shimano is owned by Toyota.Unknownhttps://www.blogger.com/profile/10915237259208774770noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-70953604655665789302010-03-03T10:28:13.295-05:002010-03-03T10:28:13.295-05:00I assume these are 10spd chains..? One more reason...I assume these are 10spd chains..? One more reason to stay with 9 speed.Velocodgerhttps://www.blogger.com/profile/11461347465806639954noreply@blogger.comtag:blogger.com,1999:blog-13887692.post-17671060571452719702010-03-03T03:55:10.566-05:002010-03-03T03:55:10.566-05:00Wiggle offered to send me a free replacement chain...Wiggle offered to send me a free replacement chain. They've spoken to Shimano and they still don't see the problem. I politely declined Wiggle's generous gesture stating that I will not use Shimano chains again until they acknowledge that there is an issue with chains having such a short lifespan.backpaqerhttps://www.blogger.com/profile/11670512306783612570noreply@blogger.com