Originally Posted by
stephr1
Seems to me that there might be more than .5% visual error in trying to use a ruler (even a steel one). Movement, visual angle, etc. would affect the reading. How do you do it and still ensure accuracy?
My experience, too (with rulers). Similar with a digital caliper. It requires multiple readings to average measurement and isolate errors. Since I use quick-links (to clean and lube chains off the bike), I find it much easier to compare the full length of chains hanging from a nail on the wall. The new chain will be shorter. When the used chain is longer by one full link, it means an elongation of close to 1% -- time to scrap it. (and I rotate 2 chains)