REO's two most memorable cars were its Reo Flying Cloud introduced in 1927 and the Reo Royale 8 of 1931.
The Flying Cloud was the first car to use Lockheed's new hydraulic internal expanding brake system and featured styling by Fabio Segardi. While Ned Jordan is credited with changing the way advertising was written with his "Somewhere West of Laramie" ads for his Jordan Playboy, Reo's Flying Cloud—a name that provoked evocative images of speed and lightness—changed the way automobiles would be named in the future. The final REO model of 1936 was a Flying Cloud.
The 1931 Reo Royale was a trendsetting design, introducing design elements thatwere a precedent for true automotive streamlining in the American market. The model was vended until 1935. Beverly Kimes, editor of the Standard Catalog of American Cars, terms the Royale "the most fabulous Reo of all". In addition to its coachwork by Murray designed by their Amos Northup, the Royale also provided buyers with a 125 hp (93 kW) straight-eight with a nine bearing crankshaft, one shot lubrication, and thermostatically controlled radiator shutters. The Royale rode upon factory wheelbases of 131 and 135 inches (3,400 mm); a 1932 custom version rode upon a 152-inch (3,900 mm) wheelbase. The Royale also featured REO's semi-automatic transmission, the Self-Shifter.