Sunbeam is a British brand, active in motorcycle production from 1912 to 1957.
It was founded by John Marston Ltd in Wolverhampton.

Among the legendary models is the Sunbeam Model 90 “Lion,” a 500 cc single-cylinder with side valves, which won the Tourist Trophy.
After World War II, Sunbeam produced the S7 (from 1948) and its improved version, the S8: these are inline 4-stroke twins with shaft drive.

The S7 is characterized by “balloon” tires (4.50 × 16), comfortable suspension, and very refined finishing.
The S8, lighter than the S7, offers more agility and a higher top speed compared to the S7.

Sunbeam also designed racing motorcycles: for example, the Sunbeam 500 Model 95 (1930s) with a 493 cc overhead-valve engine. The brand was known for its high-end finish: motorcycles were often black enamel with gold pinstripes.
Sunbeam faced technical challenges: for instance, on the S7/S8, the rear cylinder suffered from insufficient cooling, slightly limiting power.
Finally, the brand was acquired during World War II: BSA bought Sunbeam in 1943.

Inline twin 4-stroke engine, 487 cc (70×63.5), 25 horsepower at 6,000 rpm
Overhead camshaft
Battery-coil ignition
4-speed gearbox operated by right foot
Shaft and worm gear drive
Front suspension: telescopic fork – Rear suspension: sliding
Top speed: 80,8 mph