Originally Posted by
John_E
....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?
At what temperature? Just because it's a digital caliper doesn't mean you have an accurate reading, considering the inherent inaccuracy of a digital display and thermal expansion of a steel chain re: temperature.
My checker reads ."about" .25% worse than reality on the "short" side with a "snug" fit. I haven't had a worn enough chain to check the "long" side.
So, as long as the short side says "good" to "snug", I know I don't need to check further.