Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-11-12, 08:45 PM   #1
nhluhr
John Wayne Toilet Paper
Thread Starter
 
nhluhr's Avatar
 
Join Date: Feb 2006
Location: Roanoke
Bikes: BH carbon, Ritchey steel, Kona aluminum
Posts: 1,950
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chain quick-connector failure?

I recently had a KMC Missing Link blow up on me and it almost left me stranded but I happened to have the old SM-CN79 that came with my bike originally (two chains ago) in my seat pack. That at least got me home.

On the way home from work today, I stopped and picked up a new Missing Link and also a new Dura Ace Chain. I noticed the Shimano quick link isn't really available anymore but anybody else experienced total failure of the Missing Link?

I'm considering putting my chain back together with the normal Shimano connecting pins.
nhluhr is offline   Reply With Quote
Old 07-11-12, 08:48 PM   #2
Shimagnolo
Senior Member
 
Shimagnolo's Avatar
 
Join Date: May 2008
Location: Zang's Spur, CO
Bikes:
Posts: 7,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
I've used Superlinks, Powerlinks/Powerlocks, & Missing Links, and never had a failure of any of them.
Shimagnolo is offline   Reply With Quote
Old 07-11-12, 08:49 PM   #3
10 Wheels
Galveston County Texas
 
10 Wheels's Avatar
 
Join Date: Nov 2007
Location: In The Wind
Bikes: 2010 Expedition, 03 GTO
Posts: 29,375
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
Quote:
Originally Posted by Shimagnolo View Post
I've used Superlinks, Powerlinks/Powerlocks, & Missing Links, and never had a failure of any of them.
^ ^ ^ Same here.
__________________
[SIZE=1][B]What I like about Texas[/B]
http://www.youtube.com/watch?v=PGukLuXzH1E

Set F1re To The Ra1n ( NY Night Rain Ride)
http://www.youtube.com/watch?v=W7jfcWEkSrI
10 Wheels is offline   Reply With Quote
Old 07-11-12, 09:05 PM   #4
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 29,434
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Link failures are very rare, but they do happen. Without a damaged link to examine it's impossible to say why or how. OTOH, chains also break not at the connector. If you figure that connectors are about 1 out of 56 links on a typical chain, you'd expect link failures to account for about 2% of all failures, all other things being equal.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 07-11-12, 09:10 PM   #5
Sixty Fiver
Bicycle Repair Man !!!
 
Sixty Fiver's Avatar
 
Join Date: Sep 2007
Location: YEG
Bikes: See my sig...
Posts: 27,255
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
It is a rare failure but it can happen... recall that some years ago SRAM had some issues with their quick links failing but they rectified this very quickly and their quick link was improved.

My only link failure was a SRAM at this period and when it happened i was ascending a very rocky climb and it could have very well been a rock spit into the drivetrain that found the quick link which did not break, but opened and I lost my chain. Was lucky to have found the missing links and be able to ride home.
Sixty Fiver is offline   Reply With Quote
Old 07-11-12, 09:17 PM   #6
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've had failures on SRAM PowerLinks (but not PowerLocks), KMC and Wipperman/Connex. I think their weakness is partly that they're designed (with the exception of PowerLock) to come apart when compressed end-wise, although a squeeze from the sides usually helps. Chains are normally under tension, right? So it shouldn't be a problem that they might disconnect when compressed endwise... right? Well, reality is cruel, and sometimes arranges for chains to be compressed endwise in one fashion or another. Chainsuck is a prime example.

Anyway, if I had a dollar for every masterlink I've personally had come unplugged in normal use, I could probably afford a gallon of chocolate milk If you have a Shimano chain, then I'd go ahead and use the Shimano chain pins, and do it as Shimano instructs: through the rear hole of an outer link on the underside stretch of chain.
mechBgon is offline   Reply With Quote
Old 07-12-12, 03:02 AM   #7
Papa Ado
almost like new
 
Papa Ado's Avatar
 
Join Date: Apr 2012
Location: Taiwan
Bikes:
Posts: 86
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes, unfortunately connecting links are not indestructible.

They are in fact the weakest link as is created by any connection type used - Shimano pins included.
Papa Ado is offline   Reply With Quote
Old 07-12-12, 11:00 AM   #8
zebede
Hello
 
zebede's Avatar
 
Join Date: Aug 2007
Location: Suncoast, Florida
Bikes: BF Tikit, Dahon Speed TR, Mezzo I4, Miyata 610, Gitane Criterium, Dahon Helios XL
Posts: 594
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
I broke the SRAM link recently, While generally a spinner and easy on my drive train, I recently had 9 speed chain jam under loaded cross chaining shift (my bad) between my old bio pace crank . (bad set up bad shifting) The weakest link broke. Other than that I have had many thousands of miles out of these SRAM links and am a real fan and will continue to buy and use.
zebede is offline   Reply With Quote
Old 07-12-12, 11:18 AM   #9
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,870
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 229 Post(s)
.. given your experience, buy 2 , next time..
fietsbob is offline   Reply With Quote
Old 07-12-12, 08:38 PM   #10
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Bikes: too many
Posts: 26,875
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Quote:
Originally Posted by fietsbob View Post
.. given your experience, buy 2 , next time..
That's like a bet that lightning will strike twice in the same place.
__________________
Tom Reingold, noglider@pobox.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

Please email me rather than PM'ing me. Thanks.
noglider is offline   Reply With Quote
Old 07-12-12, 09:22 PM   #11
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 29,434
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Quote:
Originally Posted by noglider View Post
That's like a bet that lightning will strike twice in the same place.
I'll cover that bet.

Contrary to the popular expression, not only does lightning strike twice in the same place, it strikes hundreds (thousands) of times in the same places. Among the most frequently struck places is NY's Empire State Building, along with many mountain tops, and other high places. What makes someplace a good place for a lightning strike, makes it a good place for a repeat.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote
Old 07-12-12, 11:44 PM   #12
nhluhr
John Wayne Toilet Paper
Thread Starter
 
nhluhr's Avatar
 
Join Date: Feb 2006
Location: Roanoke
Bikes: BH carbon, Ritchey steel, Kona aluminum
Posts: 1,950
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
So, the old used Shimano quick connector didn't cause any problems today. I'm wondering if part of the issue was that the MissingLink 10R was not the locking one? Perhaps it rattled loose during the very fast descent (45-55mph for a couple miles) I had done earlier in the ride... When it started skipping through the derailleur on a short climb later, I looked down and noticed there was only one plate and both pins remaining... Not sure how the pin separated from the other plate.

I haven't had a chance (read: haven't taken the time) to put the chain together with an actual shimano pin so the quick connector remains for now. I'm away from home and don't have the extra links handy and this chain is relatively new so i don't want to just put the brand new chain on.

(for a guy who works in a shop on saturdays, i sure take crappy care of my own bikes)
nhluhr is offline   Reply With Quote
Old 07-12-12, 11:52 PM   #13
Eric S. 
Senior Member
 
Eric S.'s Avatar
 
Join Date: Aug 2005
Location: Las Vegas, NV
Bikes: '04 LeMond Buenos Aires, '82 Bianchi Nuova Racing, De Rosa SLX, Bridgestone MB-1, Guerciotti TSX, Torpado Aelle, LeMond Tourmalet 853, Bridgestone Radac
Posts: 594
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
I had 2 SRAM links fail on me. The first time was on my commuter and I pedaled my chain right off my bike in an intersection. I was able to hop off and grab it & run to the sidewalk.

The second time was on my road bike just 3 weeks later, in traffic, and when a light turned green I laid all my weight on a pedal the chain popped and I went over the bars. Luckily the cars were still just creeping and I wasn't run over.

I still use the SRAM chains but gave up on the quick links and put them together with a chain tool, the old fashioned way. I'm still a little gun-shy of really standing on my pedals to accelerate or climb.
Eric S. is offline   Reply With Quote
Old 07-13-12, 06:15 AM   #14
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Bikes: too many
Posts: 26,875
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
FBinNY, I realize that lightning re-strikes, but I'm talking about striking in an unlikely place, metaphorically speaking. Would you expect two quick links to fail for one person? I wouldn't, unless they're put on wrong somehow.
__________________
Tom Reingold, noglider@pobox.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

Please email me rather than PM'ing me. Thanks.
noglider is offline   Reply With Quote
Old 07-13-12, 07:49 AM   #15
dscheidt
Senior Member
 
Join Date: Jul 2008
Bikes:
Posts: 1,373
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by noglider View Post
FBinNY, I realize that lightning re-strikes, but I'm talking about striking in an unlikely place, metaphorically speaking. Would you expect two quick links to fail for one person? I wouldn't, unless they're put on wrong somehow.
And I'll still take that bet. I've seen people put things together the wrong way, break them, get a replacement, put the replacement together the wrong way, and break that.

Also, it's not like they're expensive, or heavy. The OP carries a seat pack, he's probably got room for a spare quick link! And they can be used to fix a chain that breaks somewhere else.
dscheidt is offline   Reply With Quote
Old 07-13-12, 09:00 AM   #16
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I keep one or two spare master links inside my Rema patch-kit box for quick roadside repairs. There's no denying the convenience factor. Shimano's replacement pins are actually pretty convenient too, although removing a damaged link and pinning the remaining chain back together does leave it shorter, whereas the master link maintains the same chain length if it's taking the place of one damaged outer link.
mechBgon is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 03:38 AM.