Speed Twin

1961 Triumph Speed Twin Technical Analysis & Specification Breakdown

Engineered by Triumph for the allround motorcycle segment, the 1961 Triumph Speed Twin utilizes a 498 cc (30.4 cu in) twin, four-stroke layout. In factory specification, peak output is rated at 27 HP (19.7 kW) at 6,300 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 54.2 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 Speed Twin measures 158.8 kg (350 lbs) dry, translating to a power-to-weight ratio of 0.17 HP/kg (5.88 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 Triumph archive, this model family spans 28 indexed model years from 1937 to 2022, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.