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Old 05-21-09, 07:46 PM   #1
artlogic
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Breaking a KMC K710SL Chain

I recently purchased a KMC K710SL chain for my fixed gear bike, and it's a bit too long at 116 links. Instead of using the included snap on link, I wanted to remove an extra link and then join it as you would with any other chain without a snap on link. Unfortunately, my chain tool (a park tool CT-5) doesn't seem to be able to push out the hollow pins. Do I need a new chain tool, or is this chain not meant to be broken?
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Old 05-21-09, 09:58 PM   #2
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Can't help you with getting the pin out. But, once you do get it out, don't re-use that pin and outer link. Use the supplied masterlink.

When the pin is driven out of a side-plate on these newer chains, the hole gets deformed/enlarged. Putting the pin back in will leave a weak point that will likely break in use.
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Old 05-22-09, 01:46 PM   #3
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Can't help you with getting the pin out. But, once you do get it out, don't re-use that pin and outer link. Use the supplied masterlink.

When the pin is driven out of a side-plate on these newer chains, the hole gets deformed/enlarged. Putting the pin back in will leave a weak point that will likely break in use.
Are you saying that not only the pin, but also the side plates (outer link) are deformed by popping the pin?
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Old 05-22-09, 02:27 PM   #4
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Both pin and outer plate suffer damage, but if the pin is a heavily peened flush-pin design, the pin is damaged the most. My chain tool has a collection of metal rings that snapped off the pins when they are pushed out.

The only chains that can be rejoined with the same pin are the older design, protruding pin models. The manufacturer's instructions will state whether this is an option. Some protruding pin SRAM chains came with a master link, but reusing a pin was also an option. It's never an option with a flush-pin chain.
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Old 05-26-09, 09:14 AM   #5
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Thanks for the advice. My LBS managed to push this pin out. They had a much larger chain tool (and a vice). Both the pin and the side plate were definitely damaged. Now that's it's the right length, the chain is working great with the supplied masterlink. Thanks again!
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Old 05-10-10, 06:41 AM   #6
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I used the search button and found this thread. I was having the same problem as the OP, and this chain broke my damn chain breaking tool!
Ridiculous.
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Old 05-10-10, 07:34 AM   #7
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I used the search button and found this thread. I was having the same problem as the OP, and this chain broke my damn chain breaking tool!
Ridiculous.
Not really. A 10-speed (or 9-speed for that matter) chain is very narrow and has flush pins so they have to be "riveted" in place to insure the chain's integrity. They may be hard to break intentionally but that keeps them from breaking unintentionally.

Solution: buy a stronger chain tool.
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