The Vintage Motorcycles
Specialists in antique, classic, veteran and vintage motorcycles.
Specialists in antique, classic, veteran and vintage motorcycles.
The 1930 Harley-Davidson Model C was a 500-class single-cylinder motorcycle produced by the Harley-Davidson Motor Company of Milwaukee, Wisconsin. It used a 30.50 cubic-inch, approximately 493 cc, air-cooled side-valve engine and was positioned as a practical lightweight road motorcycle during the difficult early years of the Great Depression.
The Model C was one of Harley-Davidson's larger single-cylinder motorcycles and was intended to provide a more substantial alternative to the company's smaller 21 cubic-inch singles. Its side-valve engine, three-speed transmission, chain final drive, and relatively compact chassis gave it a straightforward and practical mechanical specification.
The 1930 Model C used a tubular steel frame related to the frame used by Harley-Davidson's larger Model D. The chassis was adapted for the single-cylinder engine and featured a lower saddle position, reinforced front fork, and period spring front suspension.
The Model C was not an overhead-valve Peashooter racing motorcycle. It was a side-valve road machine designed primarily for practical transportation and economical ownership.
The 1930 Model C is historically important because it represents Harley-Davidson's attempt to expand its single-cylinder range into the 500 cc class while the American motorcycle industry was entering one of its most difficult economic periods.
Harley-Davidson had returned to single-cylinder motorcycles during the 1920s after concentrating heavily on its V-twin range. The company offered smaller 21 cubic-inch singles in both side-valve and overhead-valve forms, but the market also created an opportunity for a larger and more practical single-cylinder motorcycle.
The Model C was introduced as a 30.50 cubic-inch single and became Harley-Davidson's approximately 500 cc lightweight road model. Period references identify the model as part of the company's 1930 range, although some historical records indicate that the model was already available during 1929.
The larger single was intended to provide greater performance than the 21 cubic-inch machines while retaining the simplicity and relatively low operating cost associated with a single-cylinder engine.
The Model C arrived at an exceptionally difficult time. The Wall Street Crash of 1929 and the subsequent economic depression severely affected motorcycle sales in the United States and overseas.
Harley-Davidson continued to offer the Model C as part of its 1930 range alongside the 21 cubic-inch singles, the new 45 cubic-inch Model D, and the larger 74 cubic-inch Model V.
Surviving Model C motorcycles are now relatively uncommon. Their rarity is partly a consequence of their limited market position and the severe economic conditions of the early 1930s.
The 1930 Harley-Davidson Model C is powered by a 30.50 cubic-inch, approximately 492 to 493 cc, air-cooled four-stroke single-cylinder engine.
The engine uses a side-valve, or flathead, valve arrangement. This design placed the valves beside the cylinder rather than in an overhead-valve cylinder head and was well established within Harley-Davidson's larger motorcycle range.
The commonly published bore and stroke dimensions are approximately 78.6 mm by 101.6 mm, producing a displacement of approximately 492.5 cc.
Period specifications commonly give the Model C approximately 10.5 horsepower. Other historical references list approximately 10.4 horsepower at 3,600 rpm, illustrating the small differences that can occur between period and later reference data.
The long-stroke engine was designed to provide useful low- and mid-range torque rather than high engine speeds. This characteristic suited the Model C's role as a practical road motorcycle.
The engine uses carburetion and a period battery-and-coil ignition system. The 1930 specification is associated with a 6-volt electrical system.
Modern performance figures should be treated cautiously because the condition of surviving engines varies considerably. Actual speed and acceleration depend on engine condition, gearing, rider weight, road conditions, and restoration quality.
The 1930 Harley-Davidson Model C uses a three-speed manual transmission.
The three-speed gearbox provides a useful range of ratios for starting, hill climbing, and normal road operation.
The transmission is manually operated and works with a conventional motorcycle clutch.
Primary drive is by duplex chain, while final drive to the rear wheel is also by chain.
This drivetrain arrangement was typical of Harley-Davidson motorcycles of the period and provided a relatively simple and serviceable mechanical layout.
The Model C's three-speed transmission was an important part of its practical character because it allowed the 500 cc single to make better use of its torque across different road speeds.
On a surviving motorcycle, the clutch should be checked for smooth engagement and the gearbox should be inspected for correct operation of all three ratios, selector condition, bearing wear, and abnormal noise.
The primary chain, final-drive chain, sprockets, chain tension, and rear-wheel alignment should also be carefully checked during restoration or mechanical inspection.
The 1930 Model C uses a tubular steel motorcycle frame derived from the chassis architecture used by Harley-Davidson's larger motorcycles.
The Model C shared its basic frame family with the 45 cubic-inch Model D while using a lower saddle position appropriate to the single-cylinder machine.
The front fork was reinforced for the 1930 model year and used a period spring suspension arrangement.
The rear of the motorcycle uses a rigid frame, with rider comfort provided by the sprung saddle, front fork, and tire compliance.
The chassis was designed to provide a stable and durable platform while keeping the motorcycle relatively compact compared with Harley-Davidson's large V-twins.
The Model C's wheelbase is commonly listed at approximately 1,460 mm, or 57.5 inches.
Frame alignment, steering-head bearings, fork condition, engine mounting points, wheel alignment, and evidence of previous repairs should be carefully examined on any surviving example.
The 1930 Harley-Davidson Model C uses spoked wheels with period motorcycle tires.
Period specifications commonly list 4.00 x 18 tires for both the front and rear wheels.
The 1930 chassis incorporated strengthened braking components at both wheels, reflecting Harley-Davidson's continued development of braking performance during this period.
The braking system remained mechanically operated and used period drum brakes rather than the hydraulic systems found on modern motorcycles.
The relatively large 18-inch wheels and substantial tires contributed to the Model C's stable road-going character.
Brake drums, shoes, operating mechanisms, cables, wheel bearings, spokes, rims, and tires should all be carefully inspected on a surviving machine.
Modern replacement tires should be selected with attention to the original wheel dimensions and the motorcycle's period chassis characteristics.
The 1930 Harley-Davidson Model C has the distinctive appearance of an early-1930s American single-cylinder motorcycle.
The exposed side-valve engine, tubular frame, spring fork, large fuel tank, deep mudguards, sprung saddle, footboards, and chain drive create a functional appearance characteristic of Harley-Davidson's lightweight motorcycles of the period.
The 1930 Model C used bullet-shaped fuel tanks, a styling feature introduced as Harley-Davidson modernized the appearance of its motorcycle range.
The motorcycle was designed around practicality rather than sporting presentation. Its relatively large single-cylinder engine provided useful road performance without the weight and complexity of a V-twin.
The Model C's appearance also reflects Harley-Davidson's attempt to create a coherent visual identity across motorcycles ranging from small singles to large V-twins.
The headlamp and horn arrangement used on surviving 1930 examples can give the Model C a particularly distinctive frontal appearance.
The 1930 Harley-Davidson Model C is the 30.50 cubic-inch single-cylinder member of Harley-Davidson's 1930 motorcycle range.
The engine is an air-cooled side-valve single displacing approximately 493 cc and producing approximately 10.4 to 10.5 horsepower according to period and later reference sources.
The motorcycle uses a three-speed manual transmission, duplex-chain primary drive, and chain final drive.
The 1930 chassis uses a tubular steel loop frame related to the Model D, with a lower saddle position and reinforced front fork.
The motorcycle uses spring front suspension and a rigid rear frame, together with spoked wheels and approximately 4.00 x 18 tires.
The Model C was available in Harley-Davidson's standard olive-green finish, with other period color options also documented, including maroon, black, blue, gray, and cream.
The Model C occupied the 500 cc-class position between Harley-Davidson's smaller singles and its 45 and 74 cubic-inch V-twins.
The 1930 Harley-Davidson Model C provides the direct and deliberate riding experience associated with a large American single-cylinder motorcycle from the early 1930s.
The long-stroke 500 cc engine produces useful low-speed torque and a steady power delivery suited to ordinary road riding.
The three-speed transmission gives the rider greater flexibility than the simpler transmissions used on many earlier motorcycles.
The relatively compact chassis and lower saddle position make the Model C more approachable than Harley-Davidson's larger heavyweight V-twins.
Period references commonly place the Model C's top speed at around 60 mph, although actual performance depends heavily on engine condition, gearing, rider weight, and restoration quality.
The motorcycle's mechanical drum brakes and period suspension are considerably less capable than modern systems, so safe operation requires appropriate speeds and anticipation.
The 1930 Harley-Davidson Model C is historically important because it represents Harley-Davidson's expansion into the 500 cc single-cylinder market.
The company had already established smaller 21 cubic-inch singles, but the Model C provided a substantially larger engine while retaining the basic simplicity of a single-cylinder layout.
The motorcycle was introduced during one of the most difficult periods in American motorcycle history. The economic collapse that followed 1929 sharply reduced demand for discretionary purchases and increased competition from inexpensive automobiles.
Despite these conditions, Harley-Davidson maintained a broad motorcycle range that included singles and V-twins in different capacities.
The Model C also demonstrates Harley-Davidson's increasing use of side-valve technology across its practical motorcycle range. The company was simultaneously introducing the 45 cubic-inch Model D and continuing development of its larger V-twins.
The Model C therefore represents an important part of Harley-Davidson's strategy during the transition from the prosperous 1920s into the Depression era.
The 1930 Harley-Davidson Model C is an interesting collector motorcycle because it is substantially less common than the company's better-known V-twins and Peashooter-related machines.
Its 30.50 cubic-inch side-valve single is particularly significant because it should not be confused with the smaller 21 cubic-inch Harley-Davidson singles or the overhead-valve Peashooter models.
The engine cases, cylinder, side-valve arrangement, three-speed transmission, frame, fuel tank, fork, wheels, brakes, controls, and electrical equipment should all be considered when assessing originality.
Engine number authenticity is especially important on early Harley-Davidson motorcycles because the engine number was commonly used as the primary identification number on period documentation.
Period registration records, factory literature, photographs, original manuals, dealer documentation, and restoration history can provide valuable evidence of provenance.
Because many motorcycles from this period were repaired or rebuilt during their working lives, surviving examples may contain a mixture of original, period replacement, and later reproduction components.
Authenticating a 1930 Harley-Davidson Model C requires examination of the engine, frame, transmission, fuel tank, fork, wheels, brakes, controls, and electrical equipment as a complete system.
The motorcycle should have the 30.50 cubic-inch side-valve single-cylinder engine associated with the Model C rather than the smaller 21 cubic-inch engines used in the A and B families.
The three-speed transmission and chain final drive are important parts of the Model C specification.
The frame should be consistent with the 1930 tubular steel chassis and its relationship to the larger Model D frame family.
The lower saddle position, reinforced front fork, bullet-shaped fuel tanks, period wheel dimensions, and braking arrangement provide additional identification clues.
The Model C should not be confused with the overhead-valve Peashooter singles. The Peashooter name is associated with Harley-Davidson's sporting overhead-valve single-cylinder motorcycles, whereas the Model C uses a 30.50 cubic-inch side-valve engine.
It should also be distinguished from the 45 cubic-inch Model D. The Model D uses a side-valve V-twin of approximately 750 cc, while the Model C uses a single-cylinder engine of approximately 493 cc.
A strong example should demonstrate consistency between the engine, frame, transmission, chassis components, controls, and available historical documentation.
The 1930 Harley-Davidson Model C matters because it represents Harley-Davidson's attempt to build a practical 500 cc single-cylinder motorcycle during a major period of change in the American motorcycle industry.
Its 30.50 cubic-inch side-valve engine offered more displacement and performance than the company's smaller singles while retaining the simplicity of a single-cylinder layout.
The three-speed transmission, tubular steel frame, spring front fork, reinforced brakes, bullet-shaped tanks, and period electrical system demonstrate the technical direction of Harley-Davidson's lightweight motorcycles at the beginning of the 1930s.
The Model C also provides an important contrast with the famous Peashooter motorcycles. Although both belong to Harley-Davidson's single-cylinder history, the Model C was a practical side-valve road machine rather than a dedicated overhead-valve sporting model.
Its appearance during the early Depression and its relatively uncommon survival make it an especially interesting motorcycle for collectors of lesser-known Harley-Davidson models.
For collectors of early American motorcycles, the 1930 Model C offers distinctive engineering, practical 500 cc performance, Depression-era historical significance, and a direct connection with Harley-Davidson's single-cylinder development.
This 1930 Harley-Davidson Model C represents Harley-Davidson's 500-class single-cylinder motorcycle and an important part of the company's early-Depression-era history.
The approximately 493cc air-cooled side-valve single produces around 10.4 to 10.5 horsepower and is paired with a three-speed manual transmission, duplex-chain primary drive, and chain final drive.
The tubular steel frame, lower saddle position, reinforced front fork, bullet-shaped fuel tanks, spring front suspension, rigid rear chassis, and 18-inch wheels give the Model C its distinctive early-1930s appearance and riding character.
The Model C is particularly interesting to collectors because it is a practical side-valve single rather than an overhead-valve Peashooter, placing it in a less frequently encountered part of Harley-Davidson's pre-war model history.
Its introduction during the beginning of the Great Depression also gives the motorcycle considerable historical importance as Harley-Davidson sought to maintain a broad range of more affordable motorcycles alongside its larger V-twins.
For more information about the Harley-Davidson marque and other historic models, visit Harley-Davidson vintage motorcycles.
Contact us for additional photographs, detailed specifications, frame and engine numbers, service history, originality assessment, provenance, restoration details, historical documentation, and purchasing information for this 1930 Harley-Davidson Model C.
The Vintage Motorcycles presents a curated selection of historically significant American motorcycles, centered on Harley-Davidson, a defining name in United States motorcycle engineering and one of the most influential manufacturers in global motorcycling history. From early single-cylinder machines to large-displacement V-twin platforms, Harley-Davidson represents the evolution of American industrial power translated into mechanical mobility.
This collection is part of a broader historical archive of global manufacturers, accessible through our global vintage motorcycle brands archive, where American engineering is positioned alongside European developments to illustrate the parallel evolution of motorcycle design philosophies. Harley-Davidson's identity is deeply rooted in the industrial expansion of the United States, where engineering focused on torque, durability, and long-distance usability. These machines are best understood within the framework of pre-war motorcycle engineering (1900-1939), a period that established the mechanical foundations of modern motorcycling.
Each motorcycle within our collection is selected based on provenance, originality, and mechanical authenticity, ensuring alignment with museum-grade preservation standards. Available machines can be explored through our global vintage motorcycle inventory, including historically significant American machines that reflect early road expansion and long-distance riding culture. All acquisitions are supported by a fully insured international shipping service, ensuring secure global delivery for collectors and institutions.
American motorcycle engineering developed through a strong industrial foundation, where scalability, durability, and torque-focused design became defining characteristics. Harley-Davidson emerged as one of the most recognizable expressions of this philosophy, producing V-twin motorcycles that prioritized low-end power delivery and long-distance reliability.
This engineering evolution can be contextualized within broader historical developments, beginning with the experimental foundations of the pre-war motorcycle era, when global manufacturers were still defining basic mechanical architectures. During World War II, American motorcycle production shifted toward military requirements, where reliability and field performance became critical, as seen in military motorcycle development. In the post-war period, these engineering principles evolved into standardized production systems supporting global consumer demand, reflected in post-war motorcycle development.
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