The most important part of this instructable is of course the bike that your going to be using. While you could
use any bike for this project, a cruser is 100% recommended. The reason why I recommend a cruser is that most of them include luggage racks on the back. This luggage rack is vital because this is where you will place your air tank.
* If you do not have a bike with a luggage rack, you could build one using either wood, metal scraps, or even PVC pipes.
Some nice instructables on building bike luggage racks...