motorized bicycles from about 80-100 years old

all just a small part of the variety on a 3 page thread at http://motorbicycling.com/showthread.php?t=43650

you can see a better gallery of cool old motorcycles at http://www.motorcycle-usa.com/180/Motorcycle-Photo-Gallery/2003-Art-of-the-Motorcycle-Show.aspx

or just use Google and search "Art of the Motorcycle"