The Vincent Series B Rapide is universally regarded as the world's first true "superbike". Produced by Vincent Motorcycles in Stevenage, England, this stunning 998cc V-twin shattered conventional design philosophies to become the fastest production motorcycle of its era.

Engineered during an austere post-war period, it delivered unmatched transcontinental speed and mechanical elegance that allowed riders triple-digit velocities hitherto unheard of from a production motorcycle. This particular model year highlights the definitive early post-war architecture, proudly badged as "The Vincent-HRD" before the factory shortened the name.

The current owner has replaced control cables and clutch assembly, fixed lots of leaks, and claims to have generally made the bike “mostly” startable!

Historical Significance & Evolution

• The Frameless Revolution: Designed by Phil Vincent and Phil Irving, the Series B boldly abandoned the traditional heavy tubular steel frame cradle. Instead, the massive V-twin engine and unit-construction gearbox served as a stressed structural member of the chassis, bolted directly to a minimalist upper backbone.

• The Backbone Tank: The motorcycle’s upper frame member doubled as a fabricated steel box-section oil tank. This revolutionary space-saving design drastically reduced overall weight while maximizing structural stiffness.

• Precursor to the Shadow: The immense engineering triumph of the Series B Rapide directly paved the way for the legendary Black Shadow and Black Lightning variants, cementing Vincent's legacy as the king of speed throughout the mid-20th century.

Production Run

1946–1950 (The Series B was eventually succeeded by the Series C)

Total Units Built

1,847 units completed across the entire Series B production window

Serial Quirks

Unique factory numbering layout where engine numbers and frame numbers are exactly 1,900 digits apart on matching-numbers bikes

Provenance

High-value early models are typically authenticated using official factory build sheets and Works Cards

Technical Specifications

Engine & Powertrain

• Engine Type: 998cc air-cooled, four-stroke, 50-degree V-twin (pushrod OHV)

• Performance: 45 horsepower @ 5,500 RPM

• Bore & Stroke: 84 mm x 90 mm (utilizing twin Amal carburetors)

• Drivetrain: 4-speed manual transmission integrated seamlessly into a single unit-construction aluminum casing

Chassis & Performance

• Suspension: Brampton girder front forks paired with a unique, advanced triangulated cantilever rear swingarm layout

• Braking System: Dual 7-inch (180mm) internal expanding single-leading-shoe drum brakes fitted to both the front and rear wheels

• Curb Weight: Approximately 206 kg (454 lbs) dry weight

• Top Speed: 110 mph (177 km/h)