Mac

1955 Velocette Mac Technical Analysis & Specification Breakdown

Positioned in Velocette's allround motorcycle lineup, the 1955 Velocette Mac pairs a 349 cc (21.3 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 18 HP (13.1 kW) at 5,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 51.6 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 Mac measures 161 kg (355 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (8.94 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,276 mm (50.2 in) wheelbase engineered for quick, flickable steering geometry.

Within MotoLibrary's Velocette archive, this model family spans 26 indexed model years from 1934 to 1959, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.