Dogtrousers
Kilometre nibbler
Of course, Leonardo was aware of this very fact 500 years agoAnother conspiracy theory is that a riders height in CM is roughly there ideal crank length in MM....could it be that simple
Does explain why cranks are available in 165-180mm and the most common now being 172.5mm moving from 170mm as humans grow ever taller.
https://en.wikipedia.org/wiki/Template:Average_height_around_the_world