My ‘low stakes conspiracy theory’ is that adults enjoy the Brompton more than you’d think, because it’s too small for them, so it feels more like a BMX for sensible professional adults who would never think to ride a BMX or want to be seen on one.

I’ve been eyeing up Bromptons for years, especially the new G (gravel) line which has 20” wheels up from 16” and chunkier tires (for ride comfort on potholes and rough asphalt, and being able to ride down a trail). But I have no need for one, and they’re not cheap to buy on a whim.

I’d really like to try a Kwiggle folding bike, too, just for fun. The standing-riding position might feel less like riding a bike and more like ‘accelerated walking’. And it folds smaller than a Brompton tri-fold.

[1] https://www.kwigglebike.com/en_US/

12" wheels would be sheer hell on anything less than perfect pavement. Source: I own a Brompton with 16" wheels, and wouldn't ride it more than about a block without cycling gloves. It's absolutely punishing on the wrists. The elastomeric block for the rear triangle makes it pretty tolerable on your ass, but the front end is rough.