The Mezzo rolls ok with the seat-post out, but the seatpost locks the rear sub-frame in position.

The Brompton doesn't roll too well, and the silly little rollers on the outside of the bike catch the heels of many when riding. Brompton riders learn to pedal with their heels sticking out, like ducks. It's very entertaining to watch. The Brompton rollers are often discarded and replaced by skateboard wheels. Something to do with 'fitness for purpose' and 'low'.

The Mezzo, being designed by an engineer and not a socially-maladjusted plumber, puts the rollers inside the perimeter of the rear rack, where no foot may inadvertantly venture. :-) It still doesn't roll very well, but at least it looks like 'design' and not 'kludge'.

Mind you, worrying about whether a bike rolls well when folded is often a sign of 'folderitis'. It's wise to get it checked out by a medical profession at an early stage, before the warts and the tumours kick in.

Omiak:

Congrats on the ride, it looks like a nice bunch of chaps.