The California contingent of motorcycle racers would go back East and really smoke the Eastern riders. This went on for decades (1925-1960). It's a long and somewhat involved story with more than its share of intrigue. Some of the key players from 1910 to 1975 were Ray Elam, Dudley Perkins, and Bob Chaves. The above picture was taken at the National Championship hill climb at El Cerrito. You can see San Pablo Bay in the background.
(Bob Pilgrim is working on a history of California motorcycling.)