I've done some old farm tractors with my Craftsman 4HP, 25 gal, rated at 7.0SCFM. Using a siphon hopper unit and sometimes had to wait for it to catch up or cool down as it isn't rated for 100% duty cycle.

I used black beauty media. Of course this wasn't thin wall bike frames
http://www.reade.com/eastern-region-(usa)/56

I made a booth out of some old plywood and tarps so I could reuse the media and not make a big mess out in my driveway. Fortunately we have a cabinet at work that fits a bike frame.