George Adams Wyman was the first person to across the United States on a Motorized Bicycle.
In 1903, Wyman rode his 1902 California motor bicycle from San Francisco to New York City in fifty-one days, finishing twenty days before Dr. Horatio Nelson Jackson, the first person to cross the continent by automobile.
The California had a 200cc, 1.5-hp four-stroke engine attached to an ordinary diamond-frame bicycle. The cycle was equipped with 28 x 1.5 in. tires, wooden rims, a leading-link front suspension fork, a Garford spring saddle, a Duck Brake Company front roller brake, and a 1902-patent Atherton rear coaster brake.
A leathern belt-drive with a spring-loaded idler pulley directly connected the engine output shaft to the rear wheel. Using a standard steel bicycle frame, the California weighed approximately 70-80 pounds without rider, and was capable of approximately 25mph using the 30-octane gasoline of the day, with a range of 75-100 miles.