2025 Harley-Davidson® Fat Boy® Base

2025 Harley-Davidson® Fat Boy® Base

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Exterior Colors:

  • Year 2025
  • Make Harley-Davidson®
  • Model Fat Boy®
  • Engine Milwaukee-Eight® 117 Custom
2025 Harley-Davidson® Fat Boy® Base

2025 Harley-Davidson® Fat Boy® Base

2025 Harley-Davidson® Fat Boy®

Features may include:

DESIGN
  • Paint

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

  • Wheels

18-inch 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
  • 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.

  • 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
  • Five-Inch Analog Display

Analog gauge is clear and easy to read, while an integrated digital display shows key information like Ride Modes.

  • Hand Controls

Updated hand controls accommodate Cruise Control and newly integrated tech features, including Ride Modes and Traction Control.

  • 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.

Engine

Engine Milwaukee-Eight® 117 Custom
Bore 4.075 in.
Stroke 4.5 in.
Displacement 117 cu in
Compression Ratio 10.3:1
Fuel System Electronic Sequential Port Fuel Injection (ESPFI)
Exhaust 2-into-2 staggered; catalyst in muffler

Dimensions

Length 93.1 in.
Width 40 in.
Seat Height, Laden 25.9 in
Ground Clearance 4.9 in.
Rake (steering head) (deg) 30
Trail 4.1 in.
Wheelbase 65 in.
Front Tire Michelin® Scorcher 11, front and rear
Rear Tire Michelin® Scorcher 11, front and rear
Tires, Front Specification 160/60R18,70V,BW
Tires, Rear Specification 240/40R18,79V,BW
Fuel Capacity 5 gal.
Oil Capacity (w/filter) 5 qt.
Weight, In Running Order 694 lb.

Performance

Engine Torque Testing Method J1349
Engine Torque 126 ft-lb
Engine Power 104 HP / 77 kW @ 4800 rpm
Engine Torque (rpm) 3000
Lean Angle, Right (deg.) 25.6
Lean Angle, Left (deg.) 25.6
Fuel Economy: Combined City/Hwy Testing Method: Estimated City/Hwy | 47 mpg

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
Wheel Type, Front Machined, Lakester cast aluminum
Wheels Type, Rear Machined, Lakester cast aluminum
Brakes, Caliper Type 4-piston fixed front and 2-piston floating rear
Brake System Type Rotors: Front and rear silver, Split 7-spoke floating rotors

Electric

Lighting Headlamp: All LED, low beam, high beam and signature position lamp; 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

Product Photography