2021 Harley-Davidson FLHR Road King Parts & Accessories
Touring Motorcycle
Milwaukee-Eight (M8) Touring
1,039 parts available
267 Performance
163 Maintenance
609 Accessories
2021 Harley-Davidson FLHR Road King
About the 2021 Harley-Davidson FLHR Road King
The 2021 Harley-Davidson FLHR Road King is a classic-style touring motorcycle that strips away the fairing and infotainment of other touring models in favor of a timeless chrome-heavy aesthetic and a detachable windshield. This model year is most notable for the return of the mechanically actuated cable clutch, replacing the hydraulic system used in previous years. It is powered by the Milwaukee-Eight 107 engine, providing a balance of modern reliability and traditional V-twin character.
What Makes This Trim Special
- Milwaukee-Eight 107 Engine — The FLHR uses the 107ci engine, whereas the Road King Special (FLHRXS) is equipped with the larger 114ci engine.
- Chrome Finish — Features extensive chrome on the engine covers, exhaust, front end, and handlebars, unlike the blacked-out Special trim.
- Detachable Windshield — Comes standard with a clear, large-profile quick-release windshield.
- Slicer II Wheels — Equipped with Slicer II Cast Aluminum wheels; the Special uses Prodigy wheels.
Likely but unverified:
- RDRS Option — Reflex Defensive Rider Systems (traction control, cornering ABS) was available as a factory-installed option.
Key Specifications
| Engine |
Milwaukee-Eight 107 V-Twin 4 valves per cylinder, dual spark plugs |
| Displacement | 1746cc (107 cu in) |
| Fuel System | Electronic Sequential Port Fuel Injection (ESPFI) |
| Cooling | Air-cooled with oil-cooled cylinder heads |
| Transmission |
6-Speed Cruise Drive Features the new-for-2021 cable-actuated clutch |
| Drivetrain | Belt final drive, 32/68 ratio |
| Front Suspension |
49mm Dual Bending Valve (SDBV) telescopic fork Non-adjustable but features linear damping technology |
| Rear Suspension |
Premium hand-adjustable emulsion shocks Tool-less preload adjustment via a hand knob |
| Front Brakes | Dual 300mm floating rotors with 4-piston fixed Brembo calipers |
| Rear Brakes | Single 300mm fixed rotor with 4-piston fixed Brembo caliper |
| Front Tire | 130/70B18 63H |
| Rear Tire | 180/55B18 80H |
| Weight | 828 lbs (375.6 kg) in running order |
| Seat Height | 26.3 in (laden) |
| Fuel Capacity | 6.0 gal (22.7 L) |
Ownership at a Glance
What to know about maintaining a 2021 Harley-Davidson FLHR Road King
Known Issues 3
Top reported problems from owners and mechanics
Medium
Plastic Clutch Adjuster Failure
The 2021 cable clutch uses a plastic self-adjuster that can break or slip, leading to loss of clutch engagement.
Low
Clutch Safety Switch Failure
A faulty switch in the left handlebar control can prevent the bike from starting unless it is in neutral.
Low
Rear Suspension Stiffness
The emulsion shocks are often criticized for being too stiff over sharp bumps, even at the lowest preload setting.
Parts Most Owners Need
Performance Upgrades 267
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Moose Racing
All Balls Racing Fork Oil and Dust Seal Kits
$24.95 - $126.95
3 of 127 options fit
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Maintenance Parts 163
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Moose Racing
All Balls Racing Wheel Bearing and Seal Kits
$24.95 - $84.95
4 of 197 options fit
In Stock
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Alloy Art
Alloy Art Mfg. Multi Rear Brake Caliper Mount
$797.95 - $850.95
4 of 4 options fit
In Stock
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Arlen Ness
Arlen Ness Big Sucker™ Stage I Air Filter Kits for M-Eight
$399.95 - $534.95
7 of 17 options fit
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Accessories 609
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Arlen Ness
Arlen Ness Adjustable Driver and Passenger Floorboards
$624.95
1 of 6 options fit
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Frequently Asked Questions About the 2021 Harley-Davidson FLHR Road King
The 2021 model returned to a mechanically actuated cable clutch, whereas 2014-2020 models used a hydraulic system.
It features the Milwaukee-Eight 107 cubic inch (1746cc) engine. The 'Special' version (FLHRXS) has the 114ci engine.
No, the Road King is a 'stripped-down' tourer and does not include a fairing, radio, or infotainment screen.
Yes, Reflex Linked Brembo Brakes with ABS are standard equipment on the 2021 FLHR.
The engine oil capacity is approximately 5.2 quarts (4.9 liters) when changing the filter.
The standard Road King (FLHR) has chrome finishes, a 107 engine, and a windshield. The Special (FLHRXS) has blacked-out trim, a 114 engine, stretched bags, and no windshield.
This is often caused by a failed clutch safety switch in the left handlebar switch pack, a common minor issue on this platform.
With a 6-gallon tank and an average of 43-45 mpg, the theoretical range is approximately 250-270 miles.
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