2018Harley-Davidson Fat Boy
25 fields on record
The 2018 Harley-Davidson Fat Boy is a heavyweight cruiser known for its solid disc wheels, rebuilt that year on Harley's new Softail chassis. Its air-cooled 1,746cc Milwaukee-Eight V-twin makes 90 hp and 148 Nm through a six-speed gearbox and belt. A very low 654 mm seat and 298 kg wet weight make it a relaxed cruiser.
- Capacity
- 1746.0 ccm
- Engine
- V-Twin, four-stroke
- Gearbox
- 6-speed
- Dry weight
- 284.0 kg
- Seat height
- 654 mm
- Power
- 90.0 HP (66.2 kW)
What’s new for the 2018 Harley-Davidson Fat Boy
vs the 2017| Spec | 2017 | 2018 |
|---|---|---|
| Engine capacity | 1690.0 ccm (103.13 cubic inches) | 1746.0 ccm (106.55 cubic inches) |
| Power | 75.0 HP (55.2 kW) | 90.0 HP (66.2 kW) |
| Torque | 136.0 Nm (13.9 kgf-m or 100.3 ft.lbs) @ 3500 RPM | 148.0 Nm (15.1 kgf-m or 109.2 ft.lbs) @ 3000 RPM |
| Compression | 9.6:1 | 10.0:1 |
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 usEngine
- Capacity
- 1746.0 ccm
- Power
- 90.0 HP (66.2 kW)
- CO2 Emissions
- 130 CO2 g/km
- EPA Est. Fuel Consumption
- 5.54 L/100km (42.5 US mpg)
- EPA CO Emissions
- 1.4 CO g/km
- Torque
- 148.0 Nm (15.1 kgf-m) @ 3000 RPM
- Engine type
- V-Twin, four-stroke
- Power/weight ratio
- 0.3169 HP/kg (dry)
- Bore x stroke
- 100.0 x 111.1 mm
- Compression
- 10.0:1
- 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
- Seat height
- 654 mm
- Dry weight
- 284.0 kg
- Wet weight
- 298.0 kg
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 | 2026 |
|---|---|---|---|---|---|
| Capacity | 1337 cc | 1337 cc | 1690 cc | 1746 cc | 1923 cc |
| Dry weight | 295 kg | 295 kg | 284 kg | 284 kg | 284 kg |
| Seat height | 673 mm | 673 mm | 654 mm | 654 mm | 658 mm |
| Fuel capacity | 16 L | 16 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 2018 Harley-Davidson Fat Boy has a Capacity of 1746.0 ccm (106.55 cubic inches).
What engine power does the Harley-Davidson Fat Boy have?
The 2018 Harley-Davidson Fat Boy has a Power of 90.0 HP (66.2 kW).
How many gears does the Harley-Davidson Fat Boy have?
The 2018 Harley-Davidson Fat Boy has a Gearbox of 6-speed.
What is the torque of the Harley-Davidson Fat Boy?
The 2018 Harley-Davidson Fat Boy has a Torque of 148.0 Nm (15.1 kgf-m or 109.2 ft.lbs) @ 3000 RPM.
How much does the Harley-Davidson Fat Boy weigh?
The 2018 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.