Old 12-04-20, 04:17 AM
  #4  
John_E
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Thank you for the replies. I completely agree that with a standard ruler the measurement should be done on a long section under tension.

I am doing the measurement while the chain is on the bike under tension and I hope to get a similar precision with a digital caliper on 5". The digital caliper I use seem to be accurate enough to give me the stretch at 5" (it has 0.0005" accuracy) as long as I measure it right.

So you guys also agree that these drop in chain checker tools are actually shorter than they should be. Have you ever measured one with a digital caliper?

What was the largest difference you have observed? (That is, when the tool drops in %0.5 what was the shortest real stretch you have measured?).

In my measurements chain checker seems to hit %0.5 when my measured wear is as small as %0.36-%0.38.
Also some chain checkers claim that new chain usually shows at least %25 but in my measurements it measured as little as %0.1.
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