Members of the Ku Klux Klan inspect Ralph de Palma's Miller on the Overland Park highway. Denver, Colorado, July 1925.

This race was sanctioned by AAA and organized by the Denver Auto Racing Association. The driver is Ralph de Palma himself, who finished second in the first day's race. This is not IndyCar yet, but what was then called big cars racing, which evolved after the World War II into what are now called sprint cars.