2025Harley-Davidson Fat Boy
33 fields on record
The 2025 Harley-Davidson Fat Boy is a heavyweight cruiser known for its solid disc wheels and muscular stance. Its air-cooled 1,917cc V-twin makes 103 hp at 4,800 rpm and 170.8 Nm through a six-speed gearbox and belt. A very low 658 mm seat and 18.9-litre tank suit relaxed cruising, at 314.8 kg wet.
- Capacity
- 1917.0 ccm
- Engine
- V-Twin, four-stroke
- Gearbox
- 6-speed
- Dry weight
- 284.0 kg
- Seat height
- 658 mm
- Power
- 103.0 HP (77.0 kW) @ 4800 RPM
What’s new for the 2025 Harley-Davidson Fat Boy
vs the 2020| Spec | 2020 | 2025 |
|---|---|---|
| Engine capacity | 1746.0 ccm (106.55 cubic inches) | 1917.0 ccm (116.98 cubic inches) |
| Power | 86.0 HP (64.0 kW) | 103.0 HP (77.0 kW) @ 4800 RPM |
| Torque | 145.0 Nm (14.8 kgf-m or 106.9 ft.lbs) @ 3000 RPM | 170.8 Nm (17.4 kgf-m or 126.0 ft.lbs) @ 3000 RPM |
| Wet weight | 298.0 kg (657.0 pounds) | 314.8 kg (694.0 pounds) |
| Fuel capacity | — | 18.90 litres (4.99 US gallons) |
| Compression | 10.5:1 | 10.3:1 |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built for boulevard cruising and making a bold visual statement rather than outright performance or long-distance touring.
- Built for
- A muscular, iconic cruiser with a fat rear tire stance, strong low-end torque, and unmistakable classic Harley presence.
- Not ideal for
- Not the right choice for riders seeking nimble cornering, off-road capability, or a lightweight, agile everyday commuter.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usRange and running costs
Worked out in your browser - nothing is sent to usBased on the published US (EPA-style) fuel economy estimate and tank size. Real-world figures depend on how and where you ride, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.
Engine
- Capacity
- 1917.0 ccm
- Power
- 103.0 HP (77.0 kW) @ 4800 RPM
- CO2 Emissions
- 132 CO2 g/km
- EPA Est. Fuel Consumption
- 5.62 L/100km (41.9 US mpg)
- EPA CO Emissions
- 0.7 CO g/km
- Torque
- 170.8 Nm (17.4 kgf-m) @ 3000 RPM
- Engine type
- V-Twin, four-stroke
- Power/weight ratio
- 0.3627 HP/kg (dry)
- Bore x stroke
- 103.5 x 114.3 mm
- Compression
- 10.3:1
- Cooling system
- Air
- Fuel system
- Injection
- Starting
- Electric
- Aspiration
- Naturally aspirated
- Valves per cylinder
- 4
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Belt
Performance
- Top speed
- 155.0 km/h (96.3 mph)
Dimensions & weight
- Wheelbase
- 1651 mm
- Overall length
- 2365 mm
- Overall width
- 1016 mm
- Seat height
- 658 mm
- Dry weight
- 284.0 kg
- Wet weight
- 314.8 kg
- Fuel capacity
- 18.90 litres
- Ground clearance
- 125 mm
Chassis & suspension
- Rake (fork angle)
- 30.0°
- Trail
- 104 mm
Brakes & wheels
- Front tyre
- 160/60R18,70V,BWTires, Rear Specification240/40R18,79V,BWFuel Capacity5 gal.Oil Capacity
- Rear tyre
- 240/40R18,79V,BWFuel Capacity5 gal.Oil Capacity
Other
- Fuel Tank Material
- Metal
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 1990 | 1994 | 2014 | 2018 | 2025 | 2026 |
|---|---|---|---|---|---|---|
| Capacity | 1337 cc | 1337 cc | 1690 cc | 1746 cc | 1917 cc | 1923 cc |
| Dry weight | 295 kg | 295 kg | 284 kg | 284 kg | 284 kg | 284 kg |
| Seat height | 673 mm | 673 mm | 654 mm | 654 mm | 658 mm | 658 mm |
| Fuel capacity | 16 L | 16 L | — | — | 18.9 L | 18.9 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Harley-Davidson Fat Boy?
The 2025 Harley-Davidson Fat Boy has a Capacity of 1917.0 ccm (116.98 cubic inches).
What engine power does the Harley-Davidson Fat Boy have?
The 2025 Harley-Davidson Fat Boy has a Power of 103.0 HP (77.0 kW) @ 4800 RPM.
How many gears does the Harley-Davidson Fat Boy have?
The 2025 Harley-Davidson Fat Boy has a Gearbox of 6-speed.
What is the torque of the Harley-Davidson Fat Boy?
The 2025 Harley-Davidson Fat Boy has a Torque of 170.8 Nm (17.4 kgf-m or 126.0 ft.lbs) @ 3000 RPM.
How much does the Harley-Davidson Fat Boy weigh?
The 2025 Harley-Davidson Fat Boy has a Dry weight of 284.0 kg (626.1 pounds).
Shop this bike
Affiliate linksWe may earn a commission from qualifying eBay or Amazon purchases made through these links. As an Amazon Associate I earn from qualifying purchases.
Similar bikes
Same category, weighted similarity
More Harley-Davidson Motorcycles
Please log in or register if you'd like to leave a comment.
Own one? Add it to My Garage and write an owner review with an Owner badge.