The vitesse is my first folder as well, and i have to say i have no idea why Dahon use such cheap parts on this bike besides the internal gear hub. The wheel is not even kinetix comp, brakes are passable, saddle is just standard, cheap tires....and they actually charge customers 949 bucks. I got mine a few years ago so the price was reasonable, but with the new price i believe they should upgrade the vitesse with better parts. Considering you can get a similar tern bike for a much better parts and quality.
Speaking of upgrading, does anyone here know how to add a derailleur to a vitesse d7hg? It does not have a dropout or any place or a hanger. I want to change the wheels, add a 9 speed cassette and a sram x9 derailleur on it.