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 Low Rider had alloy wheels front and rear, two disc brakes on the front wheel, extended forks with a 32° rake, and a 26" seat height. Unlike the Super Glide, the Low Rider was an instant hit; outselling all other Harley-Davidson models in its first full year of production. All three FX models returned to using Fat Bob tanks, but with a special center divider that included a tachometer. A 1977 Harley-Davidson Confederate Edition of the Super Glide that featured commemorative paint and tank and fender decals was produced but in such low volume numbers - only 228 units -