Loading bike information

Fat Boy™

A HEAVYWEIGHT KNOCKOUT.

The 2025 Fat Boy is more fun than ever before with a new, high-performance Milwaukee-Eight® 117 Custom engine, a high-flowing, two-into-two exhaust system, and improved suspension.

Vehicle shown may vary visually by market and may differ from vehicles manufactured and delivered

Fat Boy™ KEY SPECS

ENGINE

Milwaukee-Eight® 117 Custom

ENGINE TORQUE

168 Nm

WEIGHT, IN RUNNING ORDER

315 kg

SEAT HEIGHT, UNLADEN

675 mm

Paint

The best factory paint in the world covers a classic rounded gas tank that is finished with a new, bold tank medallion.

Wheels

457mm machined Lakester wheels with massive tires are covered by cutback fenders for powerful stance and commanding presence.

Headlamp Nacelle

The iconic Fat Boy headlight nacelle shines in bright polished chrome, accentuating the large and muscular look of the front end.

Milwaukee-Eight® 117 Custom Engine

Milwaukee-Eight® 117 Custom V-twin engine delivers sound, feel, and all the power you need for effortless long-mile highway cruising or exhilarating in-town performance.

Engine

Type	Milwaukee-Eight® 117 Custom
Bore	103.5 mm
Stroke	114.3 mm
Displacement	1,923 cc
Compression Ratio	10.3:1
Fuel System	Electronic Sequential Port Fuel Injection (ESPFI)
Exhaust	2-into-2 staggered; catalyst in muffler

Dimensions

Length	2,365 mm
Seat Height, Unladen	675 mm
Ground Clearance	125 mm
Rake (Steering Head) (Deg)	30
Trail	104 mm
Wheelbase	1,650 mm
Tires, Front Specification	160/60R18,70V,BW
Tires, Rear Specification	240/40R18,79V,BW
Fuel Capacity	18.9 l
Oil Capacity (W/Filter)	4.7 l
Weight, In Running Order	315 kg

Performance

Engine Torque Testing Method	EC 134/2014
Engine Torque	168 Nm
Engine Torque (RPM)	3,000
Horsepower	103 HP / 77 kW @ 5020 rpm
Lean Angle, Right (DEG.)	25.6
Lean Angle, Left (DEG.)	25.6
Fuel Economy Testing Method	EU 134/2014
Fuel Economy	5.5 l/100 km
Co2 Emissions Testing Method	EU 134/2014
Co2 Emissions	128 g/km CO2

Drivetrain

Primary Drive	Chain, 34/46 ratio
Gear Ratios (Overall) 1st	9.311
Gear Ratios (Overall) 2nd	6.454
Gear Ratios (Overall) 3rd	4.793
Gear Ratios (Overall) 4th	3.882
Gear Ratios (Overall) 5th	3.307
Gear Ratios (Overall) 6th	2.79

Chassis

Front Fork	Dual-bending valve 49 mm telescopic with aluminum fork triple clamps; dual rate spring; "beer can" covers
Rear Shocks	Hidden, free piston, coil-over monoshock; 43mm stroke; hydraulic preload adjustment
Wheels, Front Type	Machined, Lakester cast aluminum
Wheels, Rear Type	Machined, Lakester cast Aluminium
Brakes, Caliper Type	4-piston fixed front and 2-piston floating rear

Electric

Lights (As Per Country Regulation), Indicator Lamps 6	Headlamp: All LED headlamp, low and high beam with signature position lighting; Tail/Stop: Bullet-style, LED stop/tail/turn signals; Front Signal Lights: LED Bullet Turn Signals
Gauges	5-inch analog speedometer with digital gear, odometer, fuel level, ride modes, heated gear, traction control, ABS, TPMS, cruise control, clock, trip, range and tachometer indication