Originally Posted by CrimsonEclipse

One wheel size fits all was always hot garbage.
At a certain point, frame geometry goes wonky.
at around 5'6", 24-26" wheels are better.
About 5'2" and below, the 20" wheels become desirable.

20" wheels are actually fun and real maneuverable in urban settings, even if you don't fold.

On paper, the larger tires are ever so slightly more efficient over distance.
A. Most riders will never notice.
B. Most riders are not in a race.
C. Exercise the POINT of riding in the FIRST place (and transportation too)