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How do I measure wear on a chainring or cassette cog?

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How do I measure wear on a chainring or cassette cog?

Old 12-18-15, 01:57 PM
  #26  
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Originally Posted by FBinNY View Post
Absolutely, eyeballing and a bit of judgement are more than adequate for this kind of thing. Of you can not bother at all and just deal with it if/when a problem manifests.

But there's a cohort of people who insist on real numbers and real measurements. so there's a tool made for that.
In a few weeks probably there'll be an app to check sprocket/chain wear with your smartphone!
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Old 12-18-15, 03:36 PM
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Originally Posted by RPK79 View Post
Place the item in a tub of water and measure the displacement. Compare this to the displacement at the time the item was new.
Displacement measures volume, no? The volume of a chain doesn't change as it elongates, does it? Are you pulling our legs?
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Old 12-18-15, 03:37 PM
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Originally Posted by noglider View Post
Displacement measures volume, no? The volume of a chain doesn't change as it elongates, does it? Are you pulling our legs?
Well, the thread is about measuring wear on a chainring and cassette so...
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Old 09-21-21, 12:04 PM
  #29  
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Originally Posted by Reynolds View Post
I made a copy of that tool (it's very simple) and found cogs have to be really worn with hook - shaped teeth to be considered worn out by the tool.
In the video, the guy says that it only works up to 21 teeth. Is that true? Any idea why it should be true?
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Old 09-21-21, 01:29 PM
  #30  
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Elongated discussion on the chain wear but the subject is sprocket wear, front and back.
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Old 09-21-21, 01:42 PM
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Originally Posted by noglider View Post
Displacement measures volume, no? The volume of a chain doesn't change as it elongates, does it? Are you pulling our legs?
Actually it does very slightly. Some metal is worn away during routine use. This wear is what causes elongation.

The change is very small. But it isn't zero.

Last edited by Hondo6; 09-21-21 at 01:45 PM. Reason: Add missing word and last para.
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