[warkaiser]

I would buy that bike, provided that it was not overly uncomfortable. The idea of a ultra-small folding bike is attractive to anyone who lives in a city.

[khafra]

The bike exists, it's just not that pretty: http://www.babygeared.com/stmifobi.html For acceptable frame rigidity in a folder that small and light, you need the triangle. FWIW, the rear-view sunglasses already exist in an uglier form, too: http://spy-stuff.blogspot.com/2006/06/rearview-sunglasses-w-... (as anybody who read the ads in the backs of 80s and 90s magazines aimed at boys knows).