S157

1955 Peugeot S157 Technical Analysis & Specification Breakdown

Built around Peugeot's scooter motorcycle platform, the 1955 Peugeot S157 features a 147 cc (9 cu in) air-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 6.6 HP (4.8 kW) at 4,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 44.9 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 S157 measures 113.4 kg (250 lbs) dry, translating to a power-to-weight ratio of 0.06 HP/kg (17.18 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,270 mm (50 in) wheelbase engineered for quick, flickable steering geometry. The 6.25-liter (1.7 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 89 km/h (55 mph).

Within MotoLibrary's Peugeot archive, this model family spans 6 indexed model years from 1953 to 1958, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.