Its advanced loop-frame pattern was similar to the 1903 Milwaukee Merkel motorcycle designed by Joseph Merkel, later of Flying Merkel fame. The three began work on a new and improved machine with an engine of 24.74 cubic inches (405 cc) with 9.75 in (24.8 cm) flywheels weighing 28 lb (13 kg). Upon testing their power-cycle, Harley and the Davidson brothers found it unable to climb the hills around Milwaukee without pedal assistance, and they wrote off their first motor-bicycle as a valuable learning experiment.

It was finished in 1903 with the help of Arthur's brother Walter Davidson. Over the next two years, he and his childhood friend Arthur Davidson worked on their motor-bicycle using the northside Milwaukee machine shop at the home of their friend Henry Melk. Harley drew up plans for a small engine with a displacement of 7.07 cubic inches (116 cc) and four-inch (102 mm) flywheels designed for use in a regular pedal-bicycle frame.

Davidson, Walter Davidson Sr., Arthur Davidson and William S. The company markets its products worldwide, and also licenses and markets merchandise under the Harley-Davidson brand, among them apparel, home décor and ornaments, accessories, toys, scale models of its motorcycles, and video games based on its motorcycle line and the community. Harley-Davidson manufactures its motorcycles at factories in York, Pennsylvania Milwaukee, Wisconsin Manaus, Brazil Bawal, India and Pluak Daeng, Thailand. The company traditionally marketed heavyweight, air-cooled cruiser motorcycles with engine displacements greater than 700 cc, but it has broadened its offerings to include more contemporary VRSC (2002) and middle-weight Street (2015) platforms. Harley-Davidson is noted for a style of customization that gave rise to the chopper motorcycle style. There are owner clubs and events worldwide, as well as a company-sponsored, brand-focused museum. The company has survived numerous ownership arrangements, subsidiary arrangements, periods of poor economic health and product quality, and intense global competition to become one of the world's largest motorcycle manufacturers and an iconic brand widely known for its loyal following. Founded in 1903, it is one of two major American motorcycle manufacturers to survive the Great Depression along with its historical rival, Indian Motorcycles. ( H-D, or simply Harley) is an American motorcycle manufacturer headquartered in Milwaukee, Wisconsin, United States.

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