Editing Motorcycle (section)

===Postwar===
[[File:Male Motorcycle rider posing with a Rudge racing bike, No. 45.jpg|thumb|Motorcycle rider on his [[Rudge-Whitworth]] motorbike, Australia, {{Circa|1935}}]]
By 1920, Harley-Davidson was the largest manufacturer,<ref>{{Cite web|url=https://pcmotors.com/harley.html|title=History of Harley-Davidson Motor Company|website=pcmotors.com|access-date=25 February 2020|archive-date=25 February 2020|archive-url=https://web.archive.org/web/20200225233333/https://pcmotors.com/harley.html|url-status=live}}</ref> with their motorcycles being sold by dealers in 67 countries.<ref>{{Cite news |title=HOG WILD; U of T professor Brendan Calder is one of the legions of baby boomers who have helped to ensure the success of the Harley-Davidson brand name, not to mention its bottom line. |first=Sharda |last=Prashad |periodical=Toronto Star |location=Toronto, Ont. |date=16 April 2006 |page=A.16 |url=https://www.proquest.com/docview/438968474 |access-date=7 July 2017 |archive-date=30 June 2017 |archive-url=https://web.archive.org/web/20170630220939/http://pqasb.pqarchiver.com/thestar/doc/438968474.html?FMT=ABS&FMTS=ABS:FT&type=current&date=&author=&pub=&edition=&startpage=&desc= |id={{ProQuest|438968474}} |url-status=live }}</ref><ref>{{Cite news |title=Harley-Davidson at 100 |first=Jeremy |last=Cato |periodical=Vancouver Sun|location=Vancouver, B.C. |date=8 August 2003 |page=E.1.Fro }}</ref>

Amongst many British motorcycle manufacturers, Chater-Lea with its twin-cylinder models followed by its large singles in the 1920s stood out. Initially, using converted a Woodmann-designed OHV Blackburne engine it became the first 350 cc to exceed {{convert|100|mph|km/h|abbr=on}}, recording {{convert|100.81|mph|km/h|abbr=on}} over the flying kilometre during April 1924.[7] Later, Chater-Lea set a world record for the flying kilometre for 350 cc and 500 cc motorcycles at {{convert|102.9|mph|km/h|abbr=on}} for the firm. Chater-Lea produced variants of these world-beating sports models and became popular among racers at the Isle of Man TT. Today, the firm is probably best remembered for its long-term contract to manufacture and supply AA Patrol motorcycles and sidecars.{{citation needed|date=November 2019}}

By the late 1920s or early 1930s, [[DKW]] in Germany took over as the largest manufacturer.<ref>{{cite web |last=Vance |first=Bill |url=http://www.autos.ca/classic-cars/motoring-memories-dkw-auto-union-1928-1966/ |work=Canadian Driver |title=Motoring Memories: DKW/Auto Union, 1928–1966 |date=24 April 2009 |access-date=17 May 2014 |archive-date=25 February 2021 |archive-url=https://web.archive.org/web/20210225174552/http://www.autos.ca/classic-cars/motoring-memories-dkw-auto-union-1928-1966/ |url-status=live }}</ref>{{sfn|de Cet |2002|p=128}}{{sfn|Walker|1999|p=61}}

[[File:ZweiRadMuseumNSU NSU-SportMax 1955.JPG|thumb|left|NSU Sportmax streamlined motorcycle, 250&nbsp;cc class winner of the [[1955 Grand Prix motorcycle racing season|1955 Grand Prix season]]]]

In the 1950s, streamlining began to play an increasing part in the development of racing motorcycles and the "dustbin fairing" held out the possibility of radical changes to motorcycle design. [[NSU Motorenwerke|NSU]] and [[Moto Guzzi]] were in the vanguard of this development, both producing very radical designs well ahead of their time.{{sfn|Willoughby |1982}}
NSU produced the most advanced design, but after the deaths of four NSU riders in the 1954–1956 seasons, they abandoned further development and quit [[Grand Prix motorcycle racing]].<ref>{{cite web |url= http://www.motorsportmemorial.org/focus.php?db=ms&n=1418 |work= Motorsport Memorial |title= Rupert Hollaus |access-date= 3 April 2008 |archive-date= 19 January 2019 |archive-url= https://web.archive.org/web/20190119053014/http://www.motorsportmemorial.org/focus.php?db=ms&n=1418 |url-status= live }}</ref>

Moto Guzzi produced competitive race machines, and until the end of 1957 had a succession of victories.<ref>{{cite web |title=Moto Guzzi History |url=http://www.motoguzzi.com/us_EN/passion/History/ |website=Moto Guzzi |access-date=23 February 2019 |archive-date=24 February 2019 |archive-url=https://web.archive.org/web/20190224002017/http://www.motoguzzi.com/us_EN/passion/History/ |url-status=live }}</ref> The following year, 1958, full enclosure fairings were banned from racing by the [[Fédération Internationale de Motocyclisme|FIM]] in the light of the safety concerns.

From the 1960s through the 1990s, small two-stroke motorcycles were popular worldwide, partly as a result of [[German Democratic Republic|East German]] [[MZ Motorrad- und Zweiradwerk|MZs]] Walter Kaaden's engine work in the 1950s.<ref name="Motocross goes International, 1947 through 1965">{{cite web |title=Motocross goes International, 1947 through 1965 |first=Ed |last=Youngblood |work=The History of Motocross, Part Two, Motorcycle Hall of Fame Museum |url=http://www.motorcyclemuseum.org/exhibits/mx/history2.asp |access-date=29 June 2007 |url-status=dead |archive-url=https://web.archive.org/web/20071113185300/http://www.motorcyclemuseum.org/exhibits/mx/history2.asp |archive-date=13 November 2007}}</ref>
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