Help...again. Breaking a Dura Ace 7900 Chain.
06-09-11, 10:02 PM
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Help...again. Breaking a Dura Ace 7900 Chain.
Hi Guys,
I give up, again. I need to shorten my Dura Ace chain. I tried my Chain breaking tool, which is 8 speed vintage. All I broke was the tool. Does a 10 speed chain need a different tool? Other than that is everything else done the same?
Many Thanks,
Tom
I give up, again. I need to shorten my Dura Ace chain. I tried my Chain breaking tool, which is 8 speed vintage. All I broke was the tool. Does a 10 speed chain need a different tool? Other than that is everything else done the same?
Many Thanks,
Tom
06-09-11, 10:41 PM
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Modern chains, 9s 10s and 11s, plus many 8s made for Hyperglide, are much harder to break than their predecessors. That's because pins used to be held in place with a simple interference fit in the outer plate, and could be pushed in either direction fairly easily.
Today's chains don't depend on a simple interference fir but instead the pins are peened over the outer plate like the rivets bridges are built with. Pushing these pins out requires breaking the head off, or at least the overhanging lip. This is also why you can no longer splice chains by pushing the pin back.
I use a homemade tool that pushes the rivet with a ball bearing until it cracks, then I switch to a conventional tool to push the pin through.
Today's chains don't depend on a simple interference fir but instead the pins are peened over the outer plate like the rivets bridges are built with. Pushing these pins out requires breaking the head off, or at least the overhanging lip. This is also why you can no longer splice chains by pushing the pin back.
I use a homemade tool that pushes the rivet with a ball bearing until it cracks, then I switch to a conventional tool to push the pin through.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“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.
06-10-11, 08:01 AM
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You can probably replace the tool's punch pin with a skinnier one. My LBS keeps those in stock,
