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Simano chain - end pin

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Simano chain - end pin

Old 12-15-10, 01:46 PM
  #1  
stancho
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Simano chain - end pin

Hi, my bike has a factory installed chain with the special "end pin". I'd like to break the chain and install a missing link. I'm considering breaking the chain at the "end pin". Now, Shimano's chain instructions say not to break a chain at the end pin.
Do you guys think this can be a problem considering I'll be installing a missing link and not an ordinary pin in its place? My reasoning for doing it is that in this way the chain will only have one link that's different. Or should I just break the chain at a different location?
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Old 12-15-10, 02:16 PM
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Break the chain at "ordinary" pins, not at the special joining pin. The joining pin is slightly oversize so you don't want to use that location for a master link.
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Old 12-15-10, 02:46 PM
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Originally Posted by HillRider View Post
Break the chain at "ordinary" pins, not at the special joining pin. The joining pin is slightly oversize so you don't want to use that location for a master link.
Not so. When a master link is installed, the outer plates are removed, so the fact that there was a joining pin at that location makes no difference. I would recommend removing the joining pin since it is the weakest pin in the chain.

A joining pin is only oversize at the ends, to creat a tight fit with the holes in the outer plates.
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Old 12-15-10, 05:19 PM
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Originally Posted by DaveSSS View Post
Not so. When a master link is installed, the outer plates are removed, so the fact that there was a joining pin at that location makes no difference.
Good point. The outer plates are the ones reamed by the special pin. As to it's being the weakest, I don't think that's true unless it was installed improperly.
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Old 12-16-10, 07:35 AM
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Originally Posted by HillRider View Post
Good point. The outer plates are the ones reamed by the special pin. As to it's being the weakest, I don't think that's true unless it was installed improperly.
Well, you're wrong. The joining pin relies on an interference fit that is much weaker on the end without the shoulder. The push out resistance provided by the heavily peened ends of the other pins is far greater. It takes far less effort to push a joining pin out, if you push on the end without the shoulder.
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Old 12-16-10, 07:50 AM
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Originally Posted by DaveSSS View Post
Well, you're wrong. The joining pin relies on an interference fit that is much weaker on the end without the shoulder. The push out resistance provided by the heavily peened ends of the other pins is far greater. It takes far less effort to push a joining pin out, if you push on the end without the shoulder.
OK, I'll accept that but the instances of chains breaking at the properly installed joining pin are very rare. So, while theoretically it's the "weak link", in practice it appears to be more than adequately strong.

To the OP: Go ahead and push out the joining pin to install your master link. It won't damage the chain where it counts and you have removed a potential weak spot.
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Old 12-16-10, 09:47 AM
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Thank you all for the replies. I agree with the reasoning above and I'm inclined to break the chain at the joining pin. My only concern is that since it is a machine installed "end pin" from the factory (and not a regular joining pin that comes with a store bought chain), it may be difficult to remove or is overly large, resulting in a loose fit of the master link over the internal plates.

Last edited by stancho; 12-16-10 at 09:52 AM.
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Old 12-16-10, 10:08 AM
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Originally Posted by stancho View Post
Thank you all for the replies. I agree with the reasoning above and I'm inclined to break the chain at the joining pin. My only concern is that since it is a machine installed "end pin" from the factory (and not a regular joining pin that comes with a store bought chain), it may be difficult to remove or is overly large, resulting in a loose fit of the master link over the internal plates.
It's not a problem. As DaveSSS posted above, the "oversize" at the joining pin only affects the outer plates and you must remove the outer plates to install a master link. The inner plates you use will be unaffected.
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Old 12-28-10, 11:41 AM
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Just a quick update. Finally got to installing the KMC missing link yesterday. Removed the "end pin" without any problems and gave the chain a good cleaning. It needed it desperately. Now I just hope that the missing link will be durable. It did seem a bit loose upon installation and easily undone by hand. Hopefully a bit of riding will fix that.
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Old 12-28-10, 11:47 AM
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The KMC "missing link" is the same design as:
- Superlink
- SRAM Powerlink/Powerlock
- IRD link
They are all more durable than a manually-installed pin.
I've been using Superlinks and SRAM links for 15 years with no failures.
I just installed a KMC chain & link on the new bike I'm building.
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Old 12-28-10, 11:51 AM
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That is how the Missing Links work. They go on easy and come off easy.
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Old 12-28-10, 02:30 PM
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Originally Posted by HillRider View Post
OK, I'll accept that but the instances of chains breaking at the properly installed joining pin are very rare. So, while theoretically it's the "weak link", in practice it appears to be more than adequately strong.

To the OP: Go ahead and push out the joining pin to install your master link. It won't damage the chain where it counts and you have removed a potential weak spot.
The only reason why a chain will break at the joining pin is if it was installed incorrectly. Think how absurd it is that shimano would manufacture replacement pins that would fail under normal use with proper installation.
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