I found this cool cheap single-speed bike on amazon http://www.amazon.de/Fixie-Singlespeed-Viking-Farben-Auswahl/dp/B00BCKQ8AS/ref=lp_235171011_1_1?s=sports&ie=UTF8&qid=1422793944&sr=1-1
However my problem with it is that it is single speed & I would like to have 27 speeds. Is it possible to do that manually? i.e. to buy speeds and add it to the bike? I would why they didn't do it themselves!