Mac

1951 Velocette Mac Technical Analysis & Specification Breakdown

Positioned in Velocette's allround motorcycle lineup, the 1951 Velocette Mac features a 349 cc (21.3 cu in) air-cooled single cylinder, four-stroke configuration. 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 700 mm (27.6 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,276 mm (50.2 in) wheelbase engineered for quick, flickable steering geometry. The 11-liter (2.9 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 121 km/h (75 mph).

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.