I do wonder about On-One geometry. My Inbred is weird, requiring a 30mm stem, a humungous stack of headset spacers and a 410mm seatpost to get even vaguely close to the riding position of my other bikes.
That's an 18" frame; the 20" would require a zero extension stem and the 16" would require a seatpost so long, it doesn't exist. And the head tube is bizarrely short and my heels clip the seatstays sometimes.