Wheels Definition and 202 Threads

Wheels and Crazy Spinning Things! For the illustration of the following model, go to http://www.corniceventures.com/images/wheels.JPG If the 2 wheels ("B1" and "B2") are the same diameter (40 inches) and are rolling forward at 4 miles per hour...Would belts "D1" and "D2" rotate hubs "C1"...

I am trying to build the back wheels for a Lou-vee-Air Car. I am having a problem -> the wheels wobble too much. I am using paper clips with 90 degree double-L bends. Can anybody pinpoint some suggestions? I am using tape to hold the clips onto the wheel. I am limited to the materials show...