2025 Harley-Davidson Fat Boy Overview
The 2025 Fat Boy packs bigger muscle, sharper style, and that unmistakable stance that has owned the road for decades.
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New Milwaukee-Eight™ 117 Custom V-twin Engine
New Intake
Wheels
New Selectable Ride Modes
New All-LED Lighting
DESIGN
Fresh paint options and a new tank medallion bring a modern edge to the enduring design that defines the Fat Boy™, marked by its wide wheels, muscular stance, and classic Harley silhouette.
PAINT
World-class factory paint wraps a classic five-gallon tank, now featuring a bold new medallion that’s designed to stand out no matter how far you ride.
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.
PERFORMANCE
The 2025 Fat Boy is more fun than ever before with a new, high-performance Milwaukee-Eight™ 117 Custom V-Twin Engine, a high-flowing, two-into-two exhaust system, and improved suspension.
NEW MILWAUKEE-EIGHT™ 117 CUSTOM V-TWIN 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.
RETUNED REAR SUSPENSION
Updated monoshock suspension is more comfortable while still firm and composed during aggressive riding.
TWO-INTO-TWO EXHAUST
A key feature of Fat Boy design, the two-into-two exhaust has been updated for high-flowing performance and a rich V-twin sound.
INNOVATION
Classic form hides a suite of modern tech made to add comfort and convenience, but never take attention away from the ride.
NEW SELECTABLE RIDE MODES + 127MM ANALOG DISPLAY
127mm display features a large, easy-to-read analog gauge positioned above an LCD screen. Hand controls enhance ergonomics and give you quick access to new selectable Ride Modes (Road, Rain, Sport), so you can fine-tune your ride like never before.
NEW HAND CONTROLS
Updated hand controls accommodate Cruise Control and newly integrated tech features, including Ride Modes and Traction Control.
NEW USB-C CHARGING
USB-C charging keeps your devices powered, so you can ride farther while using navigation, listening to music, and staying connected through your Bluetooth™ headset.
NEW ADJUSTABLE BRAKE LEVER
Tune lever distance to maximize braking efficiency regardless of rider reach.
RIDER SAFETY ENHANCEMENTS
Harley-Davidson’s Rider Safety Enhancements is all about giving you that extra peace of mind when things get a little unpredictable. It’s a set of smart tech that steps in during tricky situations, helping the Motorcycle handle traction while you’re accelerating, braking, or slowing down. With the Cornering Rider Safety Enhancements, the Motorcycle even adjusts for cornering, keeping things smooth and steady without you having to think twice.
ABS is designed to prevent the wheels from locking under braking and helps the rider maintain control when braking in a straight-line, urgent situation.
The TCS is designed to keep the rear wheel from “spinning out” when the motorcycle is accelerating in a straight line and enhances rider confidence.
DSCS is designed to reduce excessive rear-wheel slip and help prevent rear-wheel lock under powertrain-induced deceleration, which typically occurs when the rider makes an abrupt downshift gear change or quickly reduces the throttle while on wet or slippery road surfaces.
TPMS alerts the rider through the information display to low or high tire air pressure. Maintaining proper tire air pressure is important both for vehicle performance and tire life.
C-ABS is a variant of ABS that takes into consideration the lean angle of a two-wheel motorcycle, or the lateral acceleration of a Trike model. The brake pressure required to limit wheel slip when cornering is typically or lower than the pressure required under straight line operation.
C-TCS is designed to prevent the rear wheel from excessive spinning under acceleration when going straight or cornering.
On bikes equipped with C-DSCS, the system helps keep the rear wheel from slipping or locking up when you quickly downshift or let off the throttle, especially on wet or slippery roads. When turning, it can adjust based on how much a two-wheel bike is leaning or the side-to-side motion on a Trike.
Technical Specifications
Length
2,365 mm
Width
965 mm
Seat Height, Unladen
675 mm
Ground Clearance
125 mm
Rake
30
Trail
104 mm
Wheelbase
1,650 mm
Tire, Type
Michelin™ Scorcher 11, front and rear
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
Engine
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
Engine Torque Testing Method
EC 134/2014
Engine Torque
168 Nm
Engine Torque (rpm)
3000
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
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
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 aluminum
Brakes, Caliper Type
4-piston fixed front and 2-piston floating rear
Brakes, Rotor Type
Front and rear silver, Split 7-spoke floating rotors
Lights (as per country regulation), Headlamp, Tail/Stop/Front Signal Lights
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
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