BMW R18 vs Harley-Davidson Fat Boy: specs compared
Side-by-side specs of the BMW R18 (2021-2025) and the Harley-Davidson Fat Boy (2025-present), using the latest model year of each.
Key differences
- Power: BMW R18 91 hp, Harley-Davidson Fat Boy 103 hp.
- Torque: BMW R18 158 Nm, Harley-Davidson Fat Boy 171 Nm.
- Weight: BMW R18 427.3 kg, Harley-Davidson Fat Boy 314.8 kg.
Key figures
Power hp
- BMW R18 (2021-2025)91
- Harley-Davidson Fat Boy (2025-present)103 (best)
Torque Nm
- BMW R18 (2021-2025)158
- Harley-Davidson Fat Boy (2025-present)171 (best)
Weight kg
- BMW R18 (2021-2025)427.3
- Harley-Davidson Fat Boy (2025-present)314.8 (best)
Full specs
| Specification |  2021-2025 · Transcontinental Remove |  2025-present · Fat Boy 117 Remove |
|---|---|---|
| Category | Cruiser | Cruiser |
| Years | 2021-2025 | 2025-present |
| Engine | 1802cc air/oil-cooled flat-twin "Big Boxer" | 1,923cc (117 cu in) Milwaukee-Eight 117 Custom air-cooled 45-degree V-twin |
| Cylinders | 2 | 2 |
| Displacement | 1,802 cc | 1,923 cc |
| Power | 91 hp @ 4,750 rpm | 103 hp @ 4,800 rpmBest |
| Torque | 158 Nm @ 3,000 rpm | 171 Nm @ 3,000 rpmBest |
| Transmission | 6-speed manual with overdrive top gear, shaft final drive | 6-speed manual, belt final drive |
| Final drive | shaft | belt |
| Weight | 427.3 kg (wet) | 314.8 kg (wet)Best |
| Seat height | 739 mm | 658 mm |
| Fuel capacity | 23.8 LBest | 18.9 L |
| Front suspension | 49mm telescopic fork, no rider-adjustable preload or damping by design, 120mm (4.7in) travel | 49 mm dual-bending-valve telescopic fork, aluminum triple clamps, dual-rate spring |
| Rear suspension | Cantilever strut under seat w/ travel-dependent (progressive) damping and automatic load compensation, no rider adjustment | Hidden, free-piston coil-over monoshock, 43 mm stroke, hydraulic preload adjustment |
| Brake system | BMW Motorrad Full Integral ABS standard | ABS and Cornering ABS (C-DSCS) standard |
| Front brake | Dual 300mm discs, four-piston fixed calipers | 4-piston fixed caliper, silver split 7-spoke floating 300 mm rotor |
| Rear brake | Single 300mm disc, four-piston fixed caliper | 2-piston floating caliper, silver split 7-spoke floating 292 mm rotor |
| Front tire | 120/70-19 | Michelin Scorcher 11, 160/60R18 70V |
| Rear tire | 180/65-16 | Michelin Scorcher 11, 240/40R18 79V |
| Quickshifter | No | No |
| Launch price | USD 24,995 (US) | USD 22,599 (US)Best |