Here is a interesting site listing most, if not all(?) the velodromes in the world, past and present. I learned that my local track in Matsumoto has 34 degree turns. I'd like to check out the tracks with 47 degree banks, and the one in Casablanca. It lists something called the "Vandedrome" in Colorado, 1995-, portable, 125-155 meters, wood, 53 degree turns. Wow, 53 degree turns! Anyone ever ride there? It must be like surfing the north shore in Hawaii.
http://www.bikecult.com/
Dennis young
Hotaka, Japan