Harley-Davidson models. In the late summer of 1929, Harley-Davidson introduced its 45 cubic inches (737 cm³) flathead V-Twin to compete with the Indian 101 Scout and the Excelsior Super X. This was the "D" model, produced from 1929 to 1931. Riders of Indian motorcycles derisively referred to this model as the "three cylinder Harley" because the generator was upright and parallel to the front cylinder. The Great Depression began a few months after the introduction of their 45 cubic inch (737 cm³) model. Harley-Davidson's sales fell from 21,000 in 1929 to 3,703 in 1933. Despite this, Harley-Davidson unveiled a new lineup
Harley-Davidson Super Glide Harley-Davidson Super Glide The Harley-Davidson Super Glide was a motorcycle model made by the Harley-Davidson Motor Company. Reputed to be the first factory custom motorcycle, it originated Harley's FX series of motorcycles by mating Sportster components, most notably the front end, with the chassis of their larger big twin motorcycles. Super Glide models from 1991 to 2017 were based on the Dyna Glide chassis which offers a wider variety of front ends and trim levels, and for a time filled the intermediate niche between the smallest and largest Harley models; the Dyna platform has since been discontinued for the 2018