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Why use replacement pins for narrow chains?(2 posts)

Why use replacement pins for narrow chains?Jim A
Jun 4, 2001 9:21 AM
I know you're supposed to replace the pin each time you break a Shimano narrow chain (9-speed), and the replacement pins are real nice and easy to use and everything, but what's wrong with just pushing the old pin back into place as per the way we used to do it? I broke and reinstalled my narrow chain several times using the original pins before I learned about the replacement pins a couple years ago, and I never had a problem with the chain failing. I wish I never found out about replacement pins because they complicate my tool kit; the pins are not always easy to find and now I have to carry pliers to break off the guide thing. Now, I love buying tools and parts and stuff, that's half the fun, but here's the question. Is Shimano requiring us to use these replacement pins because they are basically foolproof (fool in this case = home mechanic) and thus safe from home-mechanic-induced failures, or it there some technical reason why pushing a pin back into place is not a secure fix? I would agree that pushing a pin back into place property is an acquired skill would not necessarily be easy for everyone. But it would be nice to know that either method, when done properly, is OK.
Simplegrz mnky
Jun 4, 2001 10:28 AM
The replacement pins, while being easier to install and everything, are actually sized a bit differently and will work better than pushing out an original pin and then replacing it. I too used to just push the original pin back in w/out any problems....until I did this on a friend's bike and he failed the chain. It gets way more obvious on a MTB drivetrain.

You can acutally feel the steps in the diameter of the replacment pin as you insert it - calipers will also show the variation. the way I figure it Shimano wouldn't do anything unless it was totally necessary.