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The Super X had originally been envisioned as a competitor to the Indian Scout which was, at the time, powered by a thirty-seven cubic inch V-twin engine. Indian's initial response to the Super X came in 1927, when they enlarged the Scout engine to forty-five cubic inches. This defensive move was
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The Super X competed with the 101 Scout, the D, and the DL, until 1931. During 1931, the Indian 101 Scout was replaced by a Scout model based on the heavier Chief frame, the sport solo DLD was added to the D and DL in the Harley-Davidson line, and the
Excelsior-Henderson concern ceased production of
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The design of the Super X was a considerable departure from its predecessors at
Excelsior. Where earlier Excelsiors had an enclosed primary chain transmitting power from the engine to a separate gearbox, the Super X had the engine and transmission together in a single crankcase, using a helical gear
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Constantine resigned his position at Harley-Davidson and offered his services and his project to
Excelsior. Both were accepted, leading to the introduction of the Excelsior Super X in 1925. The design proved to be competitive in motorsports in its first year despite competing against motorcycles
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The Super X was
America's first forty-five cubic inch motorcycle, and the racing class for forty-five cubic inch motorcycles was started in the United States one year after the Super X's introduction. The forty-five cubic inch class became the premier class in dirt-track racing, in which such
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In 1929, the
Excelsior-Henderson concern restyled both its motorcycle offerings, the Excelsior Super X and the Henderson Four, for a more contemporary look. These "Streamline" models had tanks that hid the top tube of the frame and wide front fenders with holes for the forks to pass through.
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to power the transmission directly from the engine. The Super X also marked the return of leading-link forks on
Excelsior motorcycles, which had earlier switched to trailing-link forks similar to those used by Indian but with coil springs instead of Indian's quarter-elliptic leaf springs.
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The Super X effectively replaced
Excelsior's other mainstream model, a sixty-one cubic inch V-Twin, which was discontinued during the first year of Super X production. The smaller motorcycle was believed to be a more suitable companion product for their
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from 1925 to 1931. It was the most famous
Excelsior motorcycle manufactured by that company and was the first American forty-five cubic inch motorcycle.
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Although the Super X came to an abrupt end, its competitors from Indian and Harley-Davidson would continue for at least a decade.
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Mitchel, D. "Harley-Davidson
Chronicle - An American Original" p. 68-69 Publications International Limited, 1997
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180:. The new Scout proved to be a formidable competitor both on the racetrack and in the marketplace.
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That year, Harley-Davidson released their forty-five cubic inch motorcycles, the D and the DL.
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motorcycles as the Indian Sport Scout and Harley-Davidson WR, KR, and XR would compete.
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1929: Introduction of 30.50ci single, Introduction of 45ci sidevalve V-twin
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followed a year later with a more decisive attack, the introduction of the
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138:, drew up plans for a mid-sized V-Twin to compete against the
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Arthur "Connie" Constantine, Assistant Chief
Engineer at the
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404:"A Potted History of Harley-Davidson: Part 1 1903-1954"
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146:, he was reprimanded for wasting the company's time.
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3 US gal (with a 1.2 gallon reserve)
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air cooled IOE 746 cc (45.5 cu in) V-twin
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124:Excelsior Motor Manufacturing & Supply Company
42:Excelsior Motor Manufacturing & Supply Company
298:"Antique Motorcycle Museum 1929 Super X Roadster"
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350:
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432:"Excelsior-Henderson History part 8: 1930-1931"
328:"Excelsior-Henderson History part 7: 1925-1929"
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191:motorcycles upon the order of its proprietor,
360:p. 104-105 Dorling-Kindersley Limited, 1995
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99:450 lb (204 kg) (estimated) (
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380:p. 36-37 Dorling-Kindersley Limited, 1993
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256:p. 41 Dorling-Kindersley Limited, 1993
229:p. 59 Dorling-Kindersley Limited, 1995
406:. Crewe, UK: American-V. Archived from
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281:Pioneers of American Motorcycle Racing
122:was a motorcycle manufactured by the
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483:Motorcycles introduced in the 1920s
358:The Encyclopedia of the Motorcycle
283:by Daniel K. Statnekov, Chapter 22
227:The Encyclopedia of the Motorcycle
150:with engines of greater capacity.
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16:Forty-five cubic inch motorcycle
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136:Harley-Davidson Motor Company
378:The Ultimate Motorcycle Book
254:The Ultimate Motorcycle Book
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158:four-cylinder motorcycle.
171:Competition in the market
24:Excelsior 750 cm3 Super-X
54:Schwinn Bicycle Company
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478:Excelsior motorcycles
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29:Type of motorcycle
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120:Excelsior Super X
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33:Excelsior Super X
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434:. Archived from
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438:on 2007-09-26
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386:0-7513-0043-8
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109:Fuel capacity
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440:. Retrieved
436:the original
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408:the original
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336:. Retrieved
332:the original
306:. Retrieved
302:the original
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162:Construction
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140:Indian Scout
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87:Transmission
38:Manufacturer
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376:Wilson, H.
356:Wilson, H.
252:Wilson, H.
225:Wilson, H.
472:Categories
442:2007-02-23
414:2011-04-04
338:2007-02-23
308:2007-02-23
211:References
60:Production
178:101 Scout
156:Henderson
68:Successor
63:1925-1931
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199:Legacy
130:Origin
96:Weight
77:Engine
457:ISBN
382:ISBN
362:ISBN
258:ISBN
231:ISBN
118:The
71:none
101:dry
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
