425 T

1959 Simson 425 T Technical Analysis & Specification Breakdown

Positioned in Simson's allround motorcycle lineup, the 1959 Simson 425 T utilizes a 247 cc (15.1 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 12 HP (8.8 kW) at 5,500 rpm, transferring power to the rear wheel through shaft drive (cardan) final drive. With a specific output of 48.6 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 425 T measures 140 kg (309 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (11.67 kg per horsepower). The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 100 km/h (62 mph).

Within MotoLibrary's Simson archive, this model family spans 6 indexed model years from 1955 to 1960, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.