hey does anyone know what I am talking about when i say "Inside Gears"? Most the commuting bikes i see here in Denmark have the gears on the inside, but I can not figure out what they are called to search for parts. My girlfriends bike has shifters, but when i look at it, i do not really see a cassette, it just appears to look like a single speed, but it apparently shifts three gears, the bike she had before till it was stolen had five gears. I really want to know what they are called, if anyone has any idea or what websites sell them it would be very helpful

they are called internal gear hubs, here's a link on brown's page about em if ya want to know all about em
http://www.sheldonbrown.com/internal-gears.html

Heres the Wiki page on Hub Gears.

http://en.wikipedia.org/wiki/Hub_gear

thanks so much for the info

Normally, a 3-speed is just called a 3-speed. Also, you'll see the Sturmey-Archer and Rohloff names connected with this a lot.