Some bikes make history. Others rewrite it. In 1988 and 1989, Willie G. Davidson rode early Fat Boy® prototypes into Daytona, seeking direct feedback from riders and igniting a legacy that would span generations. By 1990, the Fat Boy was born, quickly becoming one of the most legendary models in Harley-Davidson history. Now, 35 years later, the new 2025 Fat Boy® Gray Ghost charges forward, bringing that legacy full circle. Inspired by the riders who made it an icon, this tribute honors the past while the next generation keeps the fire burning.
Limited to just 1,990 units, each bike is individually numbered to honor the original 1990 Fat Boy®—never to be made again.
Key Specifications
| Engine Type | 2-cylinder, 4-stroke, V-twin (Milwaukee-Eight® 117 Custom) |
| Engine Capacity | 1917 cc / 117 cubic inches |
| Max Power | 101 HP / 75 kW @ 4800 rpm |
| Max Torque | 165.4Nm /122 ft-lb @ 3000 rpm |
| Fuel Tank Capacity | 19 L / 5 US gallons |
| Weight (Wet/Kerb) | 314.8 kg / 694 lbs |
| Seat Height | 657.8 mm / 25.9 inches (laden weight with 81.6 kg / 180 lb operator) |
*n/a – information not provided by manufacturer
All Specifications
Make & Model
| Model | Harley Davidson Fat Boy Gray Ghost |
| Year | 2025 |
Engine
| Engine Type | 2-cylinder, 4-stroke, V-twin (Milwaukee-Eight® 117 Custom) |
| Displacement | 1917 cc / 117 cubic inches |
| Bore x Stroke | 103.5 mm x 114.3 mm 4.075 inches x 4.5 inches |
| Compression Ratio | 10.3 : 1 |
| Number of Cylinders | 2 |
| Max Horsepower | 101 HP / 75 kW @ 4800 rpm |
| Max Torque | 165.4Nm /122 ft-lb @ 3000 rpm |
| Valve Train | Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters |
| Valves per Cylinder | 4 |
| Fuel-mixture System | Electronic Sequential Port Fuel Injection (ESPFI) |
| Lubrication System | Pressurized, dry-sump with oil cooler |
| Ignition System | Electronic ignition |
| Fuel | Premium unleaded |
| Exhaust System | 2-into-2 staggered; catalyst in muffler |
Performance
| Acceleration (0-100 km/h, 0-60 mph) | n/a |
| Fuel Consumption | 49 mpg / 20 kmpl |
| Range | ~ 245 miles / 394.28 kms |
*n/a – information not provided by manufacturer
Transmission
| Clutch | Mechanical, 10 plate wet, assist & conventional |
| Gearbox | 6-Speed Cruise Drive® |
| Primary Drive Ratio | 34:46 |
| Gear Ratios | 1st gear – 9.311 2nd gear – 6.454 3rd gear – 4.793 4th gear – 3.822 5th gear – 3.307 6th gear – 2.79 |
| Final Drive | Belt |
| Traction Control System | TCS, C-TCS |
Electrical & Electronics System
| Battery | Sealed, maintenance-free, absorbed glass mat (AGM) battery, 12V, 17.5Ah, 310 CCA at 0°F |
| Alternator/Generator | Three-phase, 48 Amp system (364 Watts @13 Volts, 900 rpm, 624 Watts max power @ 13 Volts, 2000 rpm) |
| Starter | 1.6 kW electric with solenoid shift starter motor engagement |
| Headlight Type | All LED headlamp, low and high beam with signature position lighting |
| Taillight Type | LED |
| Instrumentation | 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 |
| Riding Modes | 3 Ride Modes – Rain, Road, Sport |
| Traction Control System | TCS, C-TCS |
| ABS | ABS, C-ABS |
| Cruise Control | Standard |
Chassis & Suspension
| Frame Type | Mild steel, tubular frame; rectangular section backbone; stamped, cast, and forged junctions; MIG welded; aluminum forged fender supports |
| Front Suspension | Dual-bending valve 49 mm telescopic with aluminum fork triple clamps; dual rate spring; “beer can” covers |
| Front Suspension Travel | 5 inches / 127 mm |
| Rear Suspension | Hidden, free piston, coil-over monoshock; 43mm stroke; hydraulic preload adjustment |
| Rear Suspension Travel | 3.4 inches / 86.36 mm |
| Rake | 30 |
| Trail | 104.14 mm / 4.1 inches |
| Swingarm | Mild steel, tubular sections, stamped x-member, forged axle junctions; MIG welded; removable belt spacer |
Wheels & Brakes
| Wheels | Machined, Lakester cast aluminum |
| Front Wheel/Rim Size | 18 inches |
| Front Tire Size | 160/60R18,70V,BW |
| Rear Wheel/Rim Size | 18 inches |
| Rear Tire Size | 240/40R18,79V,BW |
| Front Brakes | 300 mm Disc, 4-piston fixed front |
| Rear Brakes | 292 mm Disc, 2-piston floating rear |
| ABS | ABS, C-ABS |
Dimension & Weights
| Overall Length | 2364.7 mm / 93.1 inches |
| Overall Width | 1016 mm / 40 inches |
| Seat Height | 657.8 mm / 25.9 inches (laden weight with 81.6 kg / 180 lb operator) |
| Wheelbase | 1651 mm / 65 inches |
| Ground Clearance | 124.4 mm / 4.9 inches |
| Fuel Tank Capacity | 19 L / 5 US gallons |
| Wet (kerb/curb) Weight | 314.8 kg / 694 lbs |
Rider Safety Enhancements
- Anti Lock Braking System (ABS)
- 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.
- Traction Control System (TCS)
- 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
- Drag-Torque Slip Control System (DSCS)
- 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.
- Tire Pressure Monitoring System (TPMS)
- 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.
- Cornering Enhanced Anti-Lock Brakes Systems (C-ABS)
- 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.
- Cornering Enhanced Traction Control System (C-TCS)
- C-TCS is designed to prevent the rear wheel from excessive spinning under acceleration when going straight or cornering.
- Cornering Drag-Torque Slip Control System (C-DSCS)
- 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.
Infotainment
- Voice Recognition Languages: Phone functions only
- Voice Recognition Languages: Tuner/Media/Navigation
- Text-to-Speech (TTS) Languages
Harley Davidson Fat Boy Gray Ghost (2025) Color Options
- Trim – Chrome
- Color –
- Reflection
