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In 1862 while Lallement was employed building baby carriages in Nancy he saw someone riding a dandy horse, a forerunner of the bicycle that required the rider to propel the vehicle by walking. Lallement modified what he had seen by adding a transmission comprising a rotary crank mechanism and pedals attached to the front-wheel hub, thus creating the first true bicycle.
He moved to Paris in 1863 and apparently interacted with the Olivier brothers who saw commercial potential in his invention. The Oliviers formed a partnership with Pierre Michaux to mass-produce a 2-wheeled velocipede. Whether these bicycles used Lallement's design of 1864 or another by Ernest Michaux is a matter of dispute. Lallement himself may have been an employee of Michaux for a short time.
Lallement left France in July 1865 for the United States, settling in Ansonia, Connecticut, where he built and demonstrated an improved version of his bicycle. With James Carroll of New Haven as his financer, he filed the earliest and only American patent application for the pedal-bicycle in April 1866, and the patent was awarded on November 20, 1866. His patent drawing shows a machine bearing a great resemblance to the style of dandy-horse built by Denis Johnson of London, with its serpentine frame, the only differences being, first, the addition of the pedals and cranks, and, second, a thin strip of iron above the frame acting as a spring upon which he mounted the saddle to provide a more comfortable ride.
Failing to interest an American manufacturer in producing his machine, Lallement returned to Paris in 1868, just as the Michaux bicycles were creating the first bicycle craze in France, an enthusiasm which spread to the rest of Europe and to America. Lallement returned to America again sometime before 1880, when he testified in a patent infringement suit on behalf of plaintiff Albert Pope, to whom he had sold the rights in his patent. At the time Lallement was living in Brooklyn and working for the Pope Manufacturing Company. He died in obscurity in 1891 in Boston at the age of 47.
David V. Herlihy presented evidence at the fourth International Cycling History Conference in Boston, Massachusetts, Oct. 11-16, 1993, that Lallement deserves credit for putting pedals on the dandy horse.
A three-and-a-half-mile section of Boston's bike network that snakes through Southwest Corridor Park from Forest Hills to Back Bay is named the Pierre Lallement Bike Path. It passes not far from the house where Lallement died in 1891.
- New York Times: Melinda Tuhis, "Bragging Rights to the Bicycle, All Thanks to a Frenchman," August 2, 1998, accessed July 18, 2010
- Patent search tool: "search: 59915", accessed July 18, 2010
- Lynne Tolman (September 5, 1993). "Lallement recognized as inventor of bicycle". Telegram & Gazette. Retrieved 2012-06-26.
- Boston Globe: Eric Moskowitz, "Bike path upgrade draws compliments for state," July 18, 2010, accessed July 18, 2010
- Massachusetts Department of Transportation: "Pierre Lallement Bike Path (3.5 miles)", accessed July 18, 2010
- Derby Hall of Fame: "Pierre Lallement, accessed July 18, 2010
- U.S. Bicycling Hall of Fame: "Pierre Lallement, The Father of the Modern Day Bicycle", accessed July 18, 2010
- Charles E. Pratt, "Pierre Lallement and his Bicycle," in Outing and the Wheelman: An Illustrated Monthly Magazine of Recreation, vol. 3, October 1883 - March 1884 (Boston: The Wheelman Company, 1884), 4-13. Google Books: available online, accessed July 18, 2010
- Frederic D. Schwarz, "Behind the Wheels", in Invention and Technology Magazine (Winter 1994)