Speed Twin 5T

1948 Triumph Speed Twin 5T Technical Analysis & Specification Breakdown

Positioned in Triumph's sport motorcycle lineup, the 1948 Triumph Speed Twin 5T relies on a 498 cc (30.4 cu in) twin, four-stroke powerplant. 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.

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 23 indexed model years from 1938 to 1966, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.