ST4

1999 Ducati ST4 Technical Analysis & Specification Breakdown

At the heart of the 1999 Ducati ST4 sport touring motorcycle, Ducati features a 916 cc (55.9 cu in) liquid-cooled v2, four-stroke configuration. In factory specification, peak output is rated at 105 HP (76.6 kW) at 8,500 rpm while maximum torque reaches 83 Nm (61.2 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 114.6 HP per liter and a 2,000 rpm working window between peak torque (6,500 rpm) and peak power (8,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the ST4 measures 236.5 kg (521 lbs) wet (curb), translating to a power-to-weight ratio of 0.44 HP/kg (2.25 kg per horsepower). Rider ergonomics and chassis geometry center around a 820 mm (32.3 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,430 mm (56.3 in) wheelbase engineered for balanced agility and highway composure. The 21-liter (5.5 US gal) fuel tank paired with a rated consumption of 5.9 L/100 km provides an estimated theoretical range of roughly 356 km (221 miles) between fill-ups, while factory top speed is listed at 243 km/h (151 mph).

Within MotoLibrary's Ducati archive, this model family spans 3 indexed model years from 1999 to 2003, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.