Your very welcome JP.
I honestly don't know about switching from single to multi-geared. Found this; http://www.google.com/cse?cx=partner...eed&gsc.page=1
I have not owned a single speed in many years and have never converted one. But some one who has will offer you their thoughts, I'm sure.
LOL, Now I wanna try one just to see whats involved. I had thought it was gonna be as simple as just swapping the rear wheel but is more complicated.