While it might be out of place to discuss bicycles here, I have noticed that one very unique thing about folding bikes that is very different from most bicycles is the attachment of the handlebars to the stem or stempost.
The 2006/20077 Downtube Mini is like many folders in that the handlebars attach directly to the stempost. This makes the handlebars centered on the pivot point of the forks.
Most bicyles have some sort of stem like this one, which extends the handlebars forward of the pivot point of the forks.
Adding barends or using funny handlebars like these Scott AT4s also move the pivot point forward if you move your hands onto the barends or the forward portions of the handlebars.
You could also add a conventional stem and some funny looking handlebars and end up with something like this...
What I have found with these mods is that moving the pivot point forward by adding a longer stem makes the bike steer more predictably and be less twitchy. Thinking about the change in geometry it makes sense. When the handlebars are centered on the pivot point a small movement of the handlebars moves the steering angle a larger amount when compared with using any stem which moves that pivot point forward. The Mini with a 130 mm stem handles much better at speeds above 25 miles per hour when compared with the stock 2006/2007 stempost. In the 2007/2008 bikes Yan has added an adjustable stempost which requires an additional stem and improves handling by moving the handlebars forward.
The fold is smaller with the handlebars centered on the stempost, but from my experience bike handling is much improved by adding a stem which moves the bars forward.
Has anyone else noticed this change in bike handling associated with changes in handlebar position? Anyone have bars that sweep backwards like bikes had back in the good old days (whenever they were)?