The Men Who Built the American Motorcycle

• Introduction
• Chapter 1 The Steam Velocipede and the French Spark
• Chapter 2 Sylvester Roper's Final Lap
• Chapter 3 The Bicycle Boom: Tooling the Nation
• Chapter 4 George Hendee and the Springfield Velodrome
• Chapter 5 Oscar Hedstrom's Pacing Machine
• Chapter 6 The Birth of the Indian: 1901
• Chapter 7 Milwaukee Sheds: The Harley Brothers and Arthur Davidson
• Chapter 8 Ole Evinrude and the Elusive Carburetor
• Chapter 9 William Harley: The Engineering Mind
• Chapter 10 Glenn Curtiss: Speed Above All Else
• Chapter 11 Ormond Beach and the V-8 Monster
• Chapter 12 The Flying Merkel and Early Chassis Innovation
• Chapter 13 Excelsior: The Chicago Heavyweight
• Chapter 14 The Motordrome Madness: Blood on the Board Tracks
• Chapter 15 Carl Stearns Clancy: Circling the Globe
• Chapter 16 Ignaz Schwinn's Iron Empire
• Chapter 17 Erwin "Cannonball" Baker: Coast-to-Coast Defiance
• Chapter 18 Mobilizing for the Great War: Olive Drab Iron
• Chapter 19 The Rise and Fall of the Henderson Four
• Chapter 20 Postwar Boom and the Great Shakeout
• Chapter 21 The Wrecking Crew: Dirt Track Supremacy
• Chapter 22 The Great Depression: Survival of the Fittest
• Chapter 23 The Battle of the Twins: Scout vs. Knucklehead
• Chapter 24 The Final War Effort and Indian's Fatal Missteps
• Chapter 25 The Last Man Standing: Milwaukee's Triumph and the End of an Era

At the turn of the twentieth century, the American landscape was defined by friction and distance. Roads beyond the paved limits of major cities were little more than rutted wagon trails, impassable during the spring thaws and choked with blinding dust throughout the summer heat. Travel was dictated by the steel rails of the steam locomotive or the endurance of the horse. Yet inside small machine shops, bicycle manufacturing plants, and drafty wooden sheds scattered across Massachusetts, Wisconsin, Ohio, and New York, a handful of obsessed machinists, patternmakers, and former racers were working on a mechanical revolution. They took the diamond frames of safety bicycles, reinforced their tubing, and shoehorned inside them crude, fire-breathing, single-cylinder gasoline engines. In doing so, they gave birth to the American motorcycle—a machine that offered ordinary citizens an unprecedented taste of personal liberation and raw mechanical speed.

This is the story of those men, whose grit, fierce rivalries, and technological breakthroughs transformed an experimental oddity into a bedrock of American industrial might. While popular history often focuses on the automotive titans of Detroit, the men who motorized the two-wheeled vehicle were the true shock troops of personal mobility. They were tinkerers operating without formal engineering degrees, cutting their teeth on the booming bicycle craze of the 1890s before racing headlong into the internal combustion age. Long before assembly lines perfected mass production, these pioneers forged crankcases by hand, hand-soldered copper fuel tanks, and designed carburetors on kitchen tables, guided only by intuition, persistence, and an unquenchable thirst for velocity.

The industry that emerged was defined by an intensely human dynamic: a collision of personalities, visions, and philosophies. In Springfield, Massachusetts, bicycle racing champion George Hendee partnered with the meticulous Swedish immigrant and toolmaker Oscar Hedstrom to create the Indian, an elegant, reliable road machine that rapidly grew into the largest motorcycle manufacturing enterprise on earth. Almost simultaneously, in a tiny backyard shed in Milwaukee, the Harley brothers—Walter, Arthur, and William—joined forces with William S. Harley, whose quiet brilliance transformed their rudimentary prototype into an engineering benchmark capable of conquering the brutal realities of the American frontier. Between these twin poles of Springfield and Milwaukee lay a constellation of audacious rivals: the restless speed demon Glenn Curtiss, who strapped a massive V-8 aero engine to two wheels to claim the fastest speed on earth; Joe Merkel, whose suspension innovations prefigured the modern chassis; and bicycle baron Ignaz Schwinn, who poured his fortune into brute-force four-cylinder engines.

Yet this was an era that exacted a terrible price for progress. To prove their products to a skeptical public, these founders sent their machines and young daredevils onto the steep, splintered banks of circular board-track motordromes. In these wooden coliseums, known grimly as "murderdromes," men rode without brakes or throttles at speeds exceeding one hundred miles per hour, shoulder-to-shoulder, risking gruesome death for a winner’s purse and the bragging rights that sold iron on Monday morning. Off the track, the competition was no less cutthroat. The race across continents, through desert sands, and into the muddy trenches of the Western Front turned manufacturing into a war of attrition. Patent battles, corporate buyouts, cut-rate price wars, and catastrophic economic depressions winnowed hundreds of hopeful marques down to a desperate few.

To understand the rise of the American motorcycle is to understand the broader crucible of American industrialization itself. It mirrors the nation's transition from rural agrarianism to urbanized mechanical dominance, tracking the evolution of the machine shop into the corporate boardroom. By the time the dust settled following the devastation of the Great Depression and the global mobilization of the Second World War, a landscape that once teemed with vibrant, idiosyncratic builders had narrowed to an iconic, bitter duel between Indian and Harley-Davidson, before culminating in the solitary survival of Milwaukee’s iron empire.

The Men Who Built the American Motorcycle is a narrative history of that golden, perilous epoch. It examines the machine not as a finished cultural icon, but as an evolving instrument forged by flesh-and-blood visionaries who risked their fortunes and their lives to tame the combustion engine. Across grease-stained workbenches, sun-bleached speed trials, and the deafening noise of the factory floor, this book brings back to life the master craftsmen, brilliant engineers, and reckless promoters who bolted an engine to two wheels, gave America its roar, and forever changed the way the world moves.

The notion of strapping an engine between two iron-rimmed carriage wheels was born not out of high engineering philosophy, but out of sheer, bone-rattling exhaustion. In the late 1860s, personal transportation in the United States was largely a matter of hooves, boots, or the newly arrived velocipede. Imported from France and quickly dubbed the "boneshaker," this crude forerunner of the modern bicycle possessed heavy wooden wheels, thick iron tires, and a set of pedals fixed directly to the front axle without the benefit of gears or freewheels. Every turn of the crank moved the machine forward only the exact circumference of the front wheel, meaning the rider had to pedal furiously while being battered by every cobblestone, rut, and horse dropping in the road. It did not take long for mechanical minds to look at this punishing contraption and wonder if the labor could be offloaded onto an iron boiler.

The most audacious of these thinkers was a Yankee tinkerer named Sylvester Hayward Roper. Born in Francestown, New Hampshire, in 1823, Roper was the quintessential nineteenth-century New England mechanic. He was a man of few words, quiet humor, and enormous mechanical intuition who had fled the family farm as soon as he was old enough to handle a lathe. He spent his early adulthood moving through the bustling industrial centers of Massachusetts, eventually settling in the Roxbury neighborhood of Boston. Roper made his living as an inventor and machinist, securing patents for everything from sewing machines and hot-air engines to a screw-threading machine. Yet his true obsession was steam. While the rest of the world looked at the steam engine and thought of massive locomotives dragging freight across prairie lines or colossal boilers driving textile mills, Roper saw a compact, versatile source of power that ought to belong to the individual craftsman on the road.

Around 1867, operating out of his small shop on Eustis Street, Roper acquired a standard wooden-frame boneshaker velocipede. He did not merely bolt a miniature kettle to the tubing; he re-engineered the vehicle from the axles up. In place of the wooden backbone, Roper forged a stout, arched hickory and iron chassis capable of carrying a bespoke power plant. Suspended between the two wheels sat a miniature charcoal-fired vertical boiler, encased in a sheet-iron jacket to prevent the rider’s woolen trousers from instantly catching fire. A tiny water reservoir was slung under the seat, doubling as a fender, while two miniature cylinders, barely over two inches in bore, were mounted on either side of the frame. Long connecting rods reached directly back from these cylinders to cranks pinned to the rear hub. Roper omitted the front pedals entirely, replacing them with fixed footrests, thereby making his vehicle the first true two-wheeled motor carriage in the Western Hemisphere.

Operating Roper’s steam velocipede was a full-body performance requiring equal parts courage and dexterity. To start, the rider knelt beside the machine with a handful of kindling and charcoal, stoking the miniature firebox until the small pressure gauge crept up toward fifty or sixty pounds per square inch. Once steam was up, the operator swung a leg over the saddle, sitting directly atop the boiler with his shins flanking the hot cylinder jackets. Control was managed through the handlebars. By twisting the steering grip forward, the rider opened a throttle valve to let live steam rush into the cylinders; twisting it backward shut the steam off and engaged a spoon-style brake pressed against the front iron tire. Exhaust steam was piped through the flue to create an artificial draft for the fire and then directed down toward the ground, wrapping the machine and its operator in a rhythmic, hissing cloud of white vapor.

The machine was astonishingly fast for its day, reportedly capable of speeds exceeding twenty-five miles per hour on smooth surfaces—a terrifying velocity on iron-banded wooden wheels traversing nineteenth-century dirt roads. Roper treated his creation not as an abstract science experiment, but as a practical personal runabout. For years, neighbors in Roxbury watched with a mixture of terror and amusement as the mild-mannered inventor went clattering past their parlors, trailing black smoke, hot sparks, and a wake of terrified horses. He took the velocipede to country fairs and agricultural expositions, charging curious spectators a dime to watch him zip around dirt ovals. To skeptical farmers and carriage builders, Roper’s machine was an alarming circus act, a noisy teakettle on wheels that defied common sense and seemed destined to blow its rider straight into the stratosphere.

Yet Roper’s pioneering steam velocipede was not a solitary spark in the void. Three thousand miles across the Atlantic, nearly identical ideas were brewing under the gas lamps of Paris. In 1869, an engineer named Louis-Guillaume Perreaux joined forces with Pierre Michaux, the celebrated carriage builder credited with popularizing the pedals-on-axle velocipede. Perreaux designed an exquisitely finished, jewel-like single-cylinder steam engine and mounted it within a heavy cast-iron drop-frame bicycle. Unlike Roper’s direct-drive rods, Perreaux used twin leather belts to transmit power to the rear axle, creating a smoother delivery of torque. Across the Rhine, other tinkerers were playing with miniature boilers, but these European experiments, like Roper’s in Boston, ran headlong into the same immovable wall: the inherent limitations of steam power.

A steam engine, no matter how brilliantly scaled down, required an enormous penalty in weight and preparation. A rider could not simply jump on and depart; one had to nurse a fire, wait for water to boil, continually monitor sight glasses, and carry along bulky fuel and heavy reserves of water that boiled off within a matter of miles. The thermal efficiency was abysmal, and the threat of scalding steam pipes rupturing between a rider's legs was an ever-present anxiety. The mechanical world was trapped in an impasse. The dream of personal, high-speed, motorized two-wheeled transport had been proven undeniably viable by Roper and Perreaux, but steam was fundamentally the wrong muscle for the job. The machine was waiting for an entirely different kind of fire.

The breakthrough did not come from steam fitters, but from the workshops of internal combustion pioneers in Germany and France. In 1885, Gottlieb Daimler and Wilhelm Maybach built their wooden Reitwagen ("riding car") in Bad Cannstatt, installing an early four-stroke petroleum engine into an awkward two-wheeled wooden chassis with training wheels. Daimler, however, viewed two wheels merely as a cheap testbed for an engine he ultimately intended to sell to maritime and four-wheeled carriage markets. Once the test was complete, he abandoned two-wheeled development.

The true spark that would jump the Atlantic and ignite the American motorcycle industry emerged out of the Parisian firm of De Dion-Bouton in the mid-1890s. Count Albert de Dion was a wealthy, dueling aristocrat with an eye for technological genius; Georges Bouton was a brilliant, self-taught mechanic who ran a modest shop in the Passage des Panoramas. Together with Bouton’s brother-in-law, Charles Trépardoux, they formed a company initially dedicated to light steam carriages. But Bouton soon realized that the future belonged to liquid hydrocarbons. By 1895, Bouton had designed a small, single-cylinder four-stroke engine that revolutionized the mechanical landscape through one critical, astonishing attribute: operating speed.

Until Bouton’s intervention, the prevailing wisdom among European engine designers, including Karl Benz, held that internal combustion engines had to turn slowly—rarely exceeding four hundred to five hundred revolutions per minute. The cast iron used for pistons was heavy, lubrication was primitive, and the mechanical flame-tube ignitions in use were far too slow to combust fuel any faster. At five hundred rpm, an engine had to be massive and heavy to generate meaningful horsepower, making it utterly useless for a lightweight two-wheeled vehicle.

Georges Bouton shattered that consensus by rethinking the physics from the inside out. He dramatically reduced the stroke, lightened the cast-iron piston, used an aluminum crankcase to slash dead weight, and integrated the flywheels inside the crankcase rather than hanging an enormous iron wheel on the outside of the crankshaft. Most crucially, Bouton pioneered a reliable, battery-and-coil electric ignition system. Utilizing a tiny mechanical contact-breaker operated by a cam, the De Dion-Bouton engine could time a high-voltage electric spark inside the combustion chamber with microsecond precision.

The result was an engineering revelation. Bouton’s featherweight engine, displacing just 138 cubic centimeters, weighed less than forty pounds yet spun freely at an unheard-of fifteen hundred to two thousand revolutions per minute. Because horsepower is a mathematical function of torque and rotational speed, this furious little mill pumped out nearly one-and-three-quarters horsepower. It was small enough to be held in a man’s arms, light enough to balance on a frame, and powerful enough to propel a two-wheeled vehicle at breakneck speeds. The engine shed its heat through delicate, cast-iron cooling fins that caught the rushing air as the vehicle moved, dispensing entirely with heavy water jackets, radiators, and pumps.

The impact of the De Dion-Bouton single-cylinder engine on late-nineteenth-century mechanics was volcanic. It was cheap to produce, extraordinarily durable, and possessed an unmatched power-to-weight ratio. Across Europe, cycle manufacturers scrambled to build tricycles and quadricycles around the French engine, and within months, imported copies began finding their way into the hands of American machinists.

In the United States, there was no centralized patent office controlling the fundamental layout of Bouton’s design, and American copyright laws at the time offered European inventors notoriously weak protections. Blueprints, imported sample engines, and detailed drawings published in technical journals like The Horseless Age circulated freely among machine shops from New York to Chicago. For an enterprising American mechanic with a lathe, a drill press, and access to a local iron foundry, the De Dion-Bouton motor was not merely an engine—it was an open-source masterclass in lightweight power.

Dozens of independent tinkerers began buying single De Dion motors from importers in New York, tearing them apart on their grease-stained workbenches, measuring every millimeter of their bore and stroke, and casting their own unlicensed, subtly modified copies. They modified the carburetors, adjusted the thread pitches from metric to imperial, beefed up the bronze bearings, and sought out ways to mount these high-revving French dynamos into the diamond frames of ordinary American bicycles.

The stage was set for an explosion of kinetic energy. The American public was already deeply in love with two-wheeled speed, riding a wave of cycling enthusiasm that had conquered every city in the country. Sylvester Roper’s stubborn, thirty-year insistence that individual transport should be mechanical and rapid had ceased to look like a madman's fantasy. The long, frustrating era of the wood-burning boiler had served its purpose, demonstrating that a human being could balance and steer an engine at speed. Now, armed with the French spark of Bouton's high-revving engine and the unparalleled manufacturing prowess of the American industrial belt, the dream of the motor-driven cycle was ready to leave the eccentric's workshop and hit the open road.