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Chain wear tool vs ruler

Old 11-18-15, 09:04 PM
  #1  
Damien09
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Chain wear tool vs ruler

I have a chain were a section of it fails on my chain checker tool but has zero strech acording the metal ruler across 12 inches in thaf section. I know the tool measures roller wear but not sure if that justifies needing a new chain
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Old 11-18-15, 09:32 PM
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I use my Rohloff chain checker as a guide. When it shows a lot of wear I use a ruler. It's the only accurate way unless you want to spend $60 on the shimano tool.
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Old 11-18-15, 09:48 PM
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I have Park's CC-3 chain wear tool and it agrees reasonably well with the 12" ruler measurement. It tends to over-report the amount of wear but not by much. However, when in doubt, the 12" ruler is the definitive answer.
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Old 11-18-15, 09:51 PM
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Chain checker and a grain of salt...
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Old 11-18-15, 10:02 PM
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Originally Posted by davidad View Post
I use my Rohloff chain checker as a guide. When it shows a lot of wear I use a ruler. It's the only accurate way unless you want to spend $60 on the shimano tool.
Pedros has introduced a tool that works just like the Shimano, but w/o the insane price: https://pedros.com/products/tools/gen...-checker-plus/
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Old 11-19-15, 01:16 AM
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Originally Posted by Shimagnolo View Post
Pedros has introduced a tool that works just like the Shimano, but w/o the insane price: https://pedros.com/products/tools/gen...-checker-plus/
Thanks for the link!
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Old 11-19-15, 01:23 AM
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That Pedro's tool looks great.
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Old 11-19-15, 05:39 AM
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I'm rather surprised you don't see wear with the ruler. Here's a couple of pix that show exactly 1/16" wear over 12". It's easier to center the mark at 1" using the ticks on either side than it is starting at 0 with no ticks to the left. With care you can less than 1/32" wear.

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Old 11-19-15, 07:30 AM
  #9  
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Just to jump in on this one, when do you replace the chain? At what point of stretch?
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Old 11-19-15, 08:50 AM
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Originally Posted by spoiledrotten View Post
Just to jump in on this one, when do you replace the chain? At what point of stretch?
I usually replace the chain at between 1/16" and 1/8" of "stretch" over 12". However, I also replace the cassette at the same time since the cogs I use the most (15T, 16T, 17T) are worn to the point they will skip on a new chain even though most of the cogs are nearly new. That said, I usually get 7,000 - 8,000 miles on a chain/cassette combination and I'm using modestly priced cassettes (Shimano 105 or Campy Veloce) so replacing both isn't a big cost.
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Old 11-19-15, 09:11 AM
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Originally Posted by HillRider View Post
I usually replace the chain at between 1/16" and 1/8" of "stretch" over 12". However, I also replace the cassette at the same time since the cogs I use the most (15T, 16T, 17T) are worn to the point they will skip on a new chain even though most of the cogs are nearly new. That said, I usually get 7,000 - 8,000 miles on a chain/cassette combination and I'm using modestly priced cassettes (Shimano 105 or Campy Veloce) so replacing both isn't a big cost.
Thanks. My Scott came with the Shimano 105 setup, so I'll most likely be sticking with that.
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Old 11-19-15, 11:16 AM
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Make sure you have at least a bit of tension on the chain. I always have measured the top of the chain with the right pedal forward and some weight on the pedal.
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Old 11-19-15, 11:33 AM
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Originally Posted by HillRider View Post
I have Park's CC-3 chain wear tool and it agrees reasonably well with the 12" ruler measurement. It tends to over-report the amount of wear but not by much. However, when in doubt, the 12" ruler is the definitive answer.
I bought the tool some months back with the intent of using it for "quick" checks.
Once the tool shows enough chain wear, I'll get out the ruler to "verify" the tool.
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Old 11-19-15, 11:51 AM
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the strange thing is its only a few links the tool reports as having .75 wear. these three spots show it and one or two shows it on the other side of the master link. could the master link have caused some weird roller wear? thanks for all the answers so far
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Old 11-19-15, 12:26 PM
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KMC has a Digital readout on theirs .. if you like that sort of thing..
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Old 11-19-15, 12:38 PM
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Originally Posted by Damien09 View Post
the strange thing is its only a few links the tool reports as having .75 wear. these three spots show it and one or two shows it on the other side of the master link. could the master link have caused some weird roller wear? thanks for all the answers so far
I initially used Superlinks back in the mid-90's. Then around 2000 they changed their mfgring, and the new ones were wearing out *fast*, like in only a few hundred miles. You could hear the link click as it passed through the drivetrain because the pins had worn so much that it was longer than spec. It was at that time I switched to SRAM links. So it is entirely possible for a master link to wear faster than the rest of the chain.
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Old 11-19-15, 06:14 PM
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Surprisingly I've found that my Park CC-2 is a better tool for critical chain wear on my 10-speed Campy chain. I wore out two Record cassettes at less than 1/16"/foot stretch. Every cog skipped with a new chain installed. Now I replace the chain at or before .55 on the CC-2, about 4,000 miles. I still prefer a steel ruler for my 9-speed Shimano chains.
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