At the heart of the 1948 Sunbeam S7 500 sport touring motorcycle, Sunbeam utilizes a 487 cc (29.7 cu in) oil & air-cooled twin, four-stroke layout. In factory specification, peak output is rated at 24 HP (17.5 kW) at 5,800 rpm, transferring power to the rear wheel through shaft drive (cardan) final drive. With a specific output of 49.3 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the S7 500 measures 194 kg (428 lbs) dry, translating to a power-to-weight ratio of 0.12 HP/kg (8.08 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,400 mm (55.1 in) wheelbase engineered for quick, flickable steering geometry.
Within MotoLibrary's Sunbeam archive, this model family spans 11 indexed model years from 1946 to 1956, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
