| MODEL | DUCATI ST4 1999 - 2000 |
| Year | 1999 - 2000 |
| Engine Type | Four-stroke 90° V-twin, desmodromic, 4 valves per cylinder (916-derived) |
| Displacement / Capacity | 916 cc |
| Bore X Stroke | 94 x 66 mm |
| Compression Ratio | 11.0:1 |
| Cooling System | Liquid cooled |
| Max Power | 78.7 kW / 107 hp @ 9000 rpm |
| Max Torque | 89 Nm / 65.6 lb-ft @ 7500 rpm |
| Ignition | Marelli electronic |
| Induction | — |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump, synthetic 20W/50 |
| Gear Box | — |
| Clutch | Hydraulically actuated dry multiplate |
| Final Drive | Chain, 2.53:1 (15/38) |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Showa GD081 43 mm fully adjustable USD fork, 130 mm / 5.1 in travel |
| Rear Suspension | Progressive linkage, Showa GD082 monoshock, 148 mm / 5.8 in travel |
| Front Brakes | 2 x 320 mm discs, 4-piston calipers |
| Rear Brakes | 245 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2070 mm / 81.5 in |
| Overall Width | 910 mm / 35.8 in |
| Overall Height | 1180 mm / 46.5 in |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 214.5 kg |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 120/70 ZR17 |
| Rear Tyre | 180/55 ZR17 |
| FUEL SYSTEM | |
| Fuel Capacity | 21 Litres / 5.5 US gal |
| Fuel Consumption | 5.1 L/100 km / 46.6 US mpg |
| Top Speed | 251 km/h / 156 mph |
The ST4 put the four-valve Desmoquattro engine from the 916 into the ST2 sport-touring chassis, answering complaints that the ST2 lacked top-end power. It makes about 107 hp and tops out near 250 km/h, with Showa suspension and Brembo brakes. The ST2 stayed on as a cheaper, softer alternative. For 2000 it gained uprated brakes, a new dash and a wider rear wheel.
