Editing Harley-Davidson (section)

===1920s===
[[File:Harley-Davidson 1000 cc HT 1923.jpg|thumb|left|Harley-Davidson 1000 cc HT 1923]]

By 1920 Harley-Davidson was the largest motorcycle manufacturer in the world, with 28,189 machines produced and dealers in 67 countries.<ref name="H-D timeline">{{cite web |url=http://www.harley-davidson.com/content/h-d/en_US/home/museum/explore/hd-timeline.html |title=HD Timeline |publisher=Harley-Davidson |url-status=dead |archive-url=https://web.archive.org/web/20140519225011/http://www.harley-davidson.com/content/h-d/en_US/home/museum/explore/hd-timeline.html |archive-date=May 19, 2014}}</ref> In 1921, Otto Walker set a record on a Harley-Davidson as the first motorcycle to win a race at an average speed greater than {{convert|100|mph|km/h|-1|abbr=on}}.<ref>{{cite web|url=http://www.motorcyclemuseum.org/halloffame/detail.aspx?RacerID=57|title=Otto Walker|work=home.ama-cycle.org|access-date=December 30, 2014|archive-date=December 30, 2014|archive-url=https://web.archive.org/web/20141230080356/http://www.motorcyclemuseum.org/halloffame/detail.aspx?RacerID=57|url-status=live}}</ref><ref>{{cite web|url=http://www.statnekov.com/motorcycles/lives19.html|title=Pioneers of American Motorcycle Racing, Chapter 19|work=American Vintage Racing Motorcycles 1900–1933|publisher=Daniel K. Statnekov|access-date=April 26, 2008|archive-date=March 24, 2017|archive-url=https://web.archive.org/web/20170324023911/http://www.statnekov.com/motorcycles/lives19.html|url-status=live}}</ref>

Harley-Davidson put several improvements in place during the 1920s, such as a new 74&nbsp;cubic inch (1,212.6 &nbsp;cc) V-Twin introduced in 1921, and the "teardrop" gas tank in 1925. They added a front brake in 1928, although only on the J/JD models.<ref>The Encyclopedia of the Harley-Davidson by Peter Henshaw and Ian Kerr, p. 139</ref> In the late summer of 1929, Harley-Davidson introduced its 45-cubic-inch (737&nbsp;cc) [[Flathead engine|flathead]] V-Twin to compete with the [[Indian 101 Scout]] and the [[Excelsior Super X]].<ref name="Chronicle68">{{Cite book|author=Mitchel, D.|title=Harley-Davidson Chronicle – An American Original|pages=[https://archive.org/details/harleydavidsonch0000mitc_u3q3/page/68 68–69]|publisher=Publications International Limited|year=1997|isbn=0-7853-2514-X|url=https://archive.org/details/harleydavidsonch0000mitc_u3q3/page/68}}</ref> This was the "D" model produced from 1929 to 1931.<ref>{{cite web |first=Andy |last=Hornsby |title=American V – A Potted History of Harley-Davidson: Part 1 1903–1954 |url=http://www.american-v.co.uk/heritage/timeline/pottedhist1/index.html |work=American V] |publisher=American-V |location=Crewe, England |access-date=June 13, 2009 |archive-url=https://web.archive.org/web/20070928094348/http://www.american-v.co.uk/heritage/timeline/pottedhist1/index.html |archive-date=September 28, 2007}}</ref> Riders of Indian motorcycles derisively referred to it as the "three cylinder Harley" because the generator was upright and parallel to the front cylinder.<ref>Mitchel, p.70</ref> In 1929, [[Vivian Bales]] drove a record 5,000 miles across the United States and Canada on a D-model.<ref>{{Cite web |date=29 August 1929 |title=Seeing the country |url=https://news.google.com/newspapers?id=3EcwAAAAIBAJ&sjid=aKYFAAAAIBAJ&dq=vivian%E2%80%93bales%20motorcycle&pg=1155,4934156 |access-date=2023-01-09 |website=news.google.com |publisher=Berkeley Daily Gazette}}</ref>