The Harley-Davidson Softail Fat Boy motorcycle specifications include a 1,338 cc (81.64 cu in) engine, power of 56 hp (40.9 kW) @ 5,000 rpm, a 5-speed gearbox, and a listed weight of 284 kg (626.1 lb).
Key specifications
The 1998 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Harley-Davidson Softail Fat Boy compares
This compares the motorcycle with all Harley-Davidson models in this specifications database. The blue marker is this model and the grey line is the Harley-Davidson database average.
About 12% lower than the Harley-Davidson database average. Around the 38th percentile across Harley-Davidson models.
Very close to the Harley-Davidson database average. Around the 61st percentile across Harley-Davidson models.
About 5% lower than the Harley-Davidson database average. Around the 17th percentile across Harley-Davidson models.
Harley-Davidson database percentile rankings
Percentiles show where this motorcycle sits across the Harley-Davidson specifications database. They are descriptive database rankings, not performance ratings.
56 hp — more powerful than about 38% of Harley-Davidson models with power data.
1,338 cc — larger displacement than about 61% of Harley-Davidson models.
654 mm — taller than about 17% of Harley-Davidson models.
Mechanical overview
Additional useful specifications
| Power-to-weight ratio | 0.197 hp/kg |
|---|---|
| Power-to-weight | 197.2 hp/tonne |
| Specific power | 41.9 hp/L |
Model information
| Category | Custom / cruiser |
|---|
Engine specifications
| Engine type | V2, four-stroke |
|---|---|
| Displacement | 1,338 cc (81.64 cu in) |
| Power | 56 hp (40.9 kW) @ 5,000 rpm |
| Torque | 99.0 Nm (10.1 kgf-m or 73.0 ft.lbs) @ 2,350 rpm |
| Valves per cylinder | 2.0 |
| Cooling system | Air |
| Starter | Electric |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Belt (final drive) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|
Dimensions and weight
| Dry weight | 284 kg (626.1 lb) |
|---|---|
| Seat height | 654 mm (25.7 inches) |
Performance
| Top speed | 155.0 km/h (96.3 mph) |
|---|---|
| Power/weight ratio | 0.1972 hp/kg |
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Harley-Davidson models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Harley-Davidson information before relying on them. Visit the official Harley-Davidson website.