Leader

1959 Ariel Leader Technical Analysis & Specification Breakdown

Built around Ariel's touring motorcycle platform, the 1959 Ariel Leader features a 249 cc (15.2 cu in) air-cooled twin, two-stroke configuration. In factory specification, peak output is rated at 16 HP (11.7 kW) at 6,400 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 64.3 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the Leader measures 150 kg (331 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (9.38 kg per horsepower). Rider ergonomics and chassis geometry center around a 762 mm (30 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,295 mm (51 in) wheelbase engineered for quick, flickable steering geometry. The 9-liter (2.4 US gal) fuel tank paired with a rated consumption of 2.94 L/100 km provides an estimated theoretical range of roughly 306 km (190 miles) between fill-ups, while factory top speed is listed at 110 km/h (68 mph).

Within MotoLibrary's Ariel archive, this model family spans 8 indexed model years from 1958 to 1965, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.