ST4

2003 Ducati ST4 Technical Analysis & Specification Breakdown

Built around Ducati's sport touring motorcycle platform, the 2003 Ducati ST4 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 9,000 rpm while maximum torque reaches 89 Nm (65.6 lb-ft) at 7,500 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 1,500 rpm working window between peak torque (7,500 rpm) and peak power (9,000 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 215 kg (474 lbs) dry, translating to a power-to-weight ratio of 0.49 HP/kg (2.05 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 supports practical everyday commuting and weekend road stints.

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.