vincenzosi said: I'd also like to know what categorizes "wrong" size, seeing as we obviously have insight into every single person's "right" size after saying it's subjective.

I think the above estatement implies that: MOST people TOLERATE bad fit. And, what's worse is that people are often 'forced' to fit the BIKE by compromising on the fundamentals of an 'efficient' fit.

Example: If the reach to the handle-bar is too long for the rider then the seat is moved forward to shorten the reach, thereby messing up the 'knee over the pedal principle'. A better solution might be to change the bike to a smaller size so that the knee stays over the pedal and the rider can also reach the handle-bar.

In other words, the author did not claim to KNOW the EXACT/CORRECT size for each person using a dogmatic theory. He/she rather SEES/FEELS that most people put up with bad fit without knowing any better.

Regards.