Originally Posted by
asgelle
You should read up on metrology. To paraphrase Robert Chung, just because you aren't able or can't imagine how to make a measurement, doesn't mean that others with skill can't.
But it also doesn’t mean that you have to have unnecessary precision. Good enough is usually, well, good enough. There’s no need for ±1 nm tolerance in bicycling. There’s probably little need for ±1 no tolerance in
any machine. It is probably even detrimental since there forces get weird at that small a distance.