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Chain wear question

Old 09-16-22, 03:04 PM
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stargazer48
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Chain wear question

I have an 8 speed low to mid end shimano rear drivetrain. After about 1500 miles, I began monitoring my chain wear after each 25+ mile ride using the Park Tool C-3.2. I am now over 2000 miles and noticed a small percentage of links are at .75% in one section of the chain. Even though I have a low/mid end drivetrain, I prefer not have to replace it yet. I had planned to change the chain when I get a larger chainring which is due to arrive in 4 to 10 days. In people's opinion, can I ride another 100+ miles while waiting for the chainring without damaging the 8 speed cassette and derailleur since the majority of the chain is under .75%, at this moment.
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Old 09-16-22, 04:11 PM
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Unless you're running without any lubrication at all, 100 miles is meaningless.

Keep in mind that wear replacement guidelines are just that----- GUIDELINES --- and not cut in stone.

There's plenty of fudge room, so no sweat.
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Old 09-16-22, 04:22 PM
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I just lubed and cleaned the cassette and derailleur wheels a few days ago
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Old 09-16-22, 04:33 PM
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The Park Tool C-3.2 is a chain-breaking tool, not a measurement tool.

It is extremely unlikely that your chain is wearing that unevenly. It is much more likely user error for whatever tool it is that you are using.

The CC-3.2 Park tool is notoriously inaccurate. They replaced it with a better one a few years ago, with the CC-4.

https://www.parktool.com/en-us/produ...n-checker-cc-4

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Old 09-16-22, 06:24 PM
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Originally Posted by Polaris OBark View Post
The Park Tool C-3.2 is a chain-breaking tool, not a measurement tool.

It is extremely unlikely that your chain is wearing that unevenly. It is much more likely user error for whatever tool it is that you are using.

The CC-3.2 Park tool is notoriously inaccurate. They replaced it with a better one a few years ago, with the CC-4.

https://www.parktool.com/en-us/produ...n-checker-cc-4
Ok, I left the extra C out. Btw, the chain breaker is CT-3.2 so you left the T out. I guess we all make simple mistakes. Anyway, I was describing the actions/results of a chain checker not a breaker. I have been using it for the last 500 miles as I wrote and always checked the chain in several different sections and never got .75% until TODAY. Assuming, one trusts the tool, it worked as advertised. Thanks for your contribution.
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Old 09-16-22, 06:31 PM
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A good way to double check your chain measurements is to check with a tape measure. Measure out 12" of links. 1/16" over is worn out. Use edge of pins as a reference point.

As @FBinNY suggests, I'd probably go ahead and do that 100 mile ride.

What is the difference in chainring sizes? You could also just add links equal to half the extra number of teeth on the chainring and install the new chain now.
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Old 09-16-22, 07:06 PM
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You'll know real quick if you've worn out your rear cassette when you put on the new chainrings and chain if it starts acting like it's skipping back there. Don't worry about the derailleurs, chain wear doesn't effect them (at least not enough to worry about it).
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Old 09-16-22, 08:48 PM
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CliffordK is right on as to what I would advise. A steel tape is your friend.
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Old 09-16-22, 09:26 PM
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Bill Kapaun
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See post 12
https://www.bikeforums.net/bicycle-m...l#post22650075
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Old 09-16-22, 11:07 PM
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Originally Posted by stargazer48 View Post
Ok, I left the extra C out. Btw, the chain breaker is CT-3.2 so you left the T out. I guess we all make simple mistakes. Anyway, I was describing the actions/results of a chain checker not a breaker. I have been using it for the last 500 miles as I wrote and always checked the chain in several different sections and never got .75% until TODAY. Assuming, one trusts the tool, it worked as advertised. Thanks for your contribution.
The main point is if you are using the CC-3.2, you might want to use something else to double-check, like the CC-4, or a caliper or other accurate measuring device.
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