| MODEL | HARLEY-DAVIDSON ROAD KING FLHR 2021 |
| Year | 2021 |
| Engine Type | Four-stroke, 45° V-twin, Milwaukee-Eight 107, pushrod-operated OHV, hydraulic self-adjusting lifters, 4 valves per cylinder |
| Displacement / Capacity | 1746 cc / 107 cu in |
| Bore X Stroke | 100 x 111 mm / 3.937 x 4.374 in |
| Compression Ratio | 10.0:1 |
| Cooling System | Air/oil-cooled |
| Max Power | — |
| Max Torque | 150.5 Nm / 111 lb-ft @ 3250 rpm |
| Ignition | Single-fire, non-wasted, map-controlled spark ignition |
| Induction | Electronic Sequential Port Fuel Injection (ESPFI) |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Pressurised, dry sump with oil cooler |
| Gear Box | 6-speed Cruise Drive |
| Clutch | Hydraulically actuated 9-plate wet, assist & slip |
| Final Drive | Belt (chain primary, 34/46) |
| CHASSIS SPECS | |
| Frame | Mild steel tubular frame, two-piece stamped and welded backbone, cast and forged junctions, twin downtubes, bolt-on rear frame |
| Front Suspension | 49 mm Showa Dual Bending Valve fork, 117 mm / 4.6 in travel |
| Rear Suspension | Low-profile shocks with hand-adjustable preload, 54.6 mm / 2.15 in travel |
| Front Brakes | 2 x 300 mm floating discs, 4-piston fixed Brembo calipers, ABS |
| Rear Brakes | Single 300 mm disc, 4-piston fixed Brembo caliper, ABS |
| DIMENSION SPECS | |
| Overall Length | 2450 mm / 96.5 in |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 706 mm / 27.8 in (unladen); 668 mm / 26.3 in (laden) |
| Wheelbase | 1625 mm / 64 in |
| Ground Clearance | 135 mm / 5.3 in |
| Dry Weight | 360 kg / 794 lb |
| Wet Weight | 376 kg / 828 lb |
| WHEEL SPECS | |
| Front Tyre | 130/70B18 63H |
| Rear Tyre | 180/55B18 80H |
| FUEL SYSTEM | |
| Fuel Capacity | 22.7 Litres / 6.0 US gal |
| Fuel Consumption | 5.2 L/100 km / 45 US mpg (combined) |
| Top Speed | — |
The 2021 Road King kept the Milwaukee-Eight 107 and the 18-inch wheels adopted for 2020, paired with the classic windshield, chrome-trimmed nacelle and hard saddlebags. It remained the traditional-looking choice in H-D's touring range alongside the darker Road King Special.
