2012 Harley-Davidson FLHR Road King Technical Analysis & Specification Breakdown
Built around Harley-Davidson's touring motorcycle platform, the 2012 Harley-Davidson FLHR Road King pairs a 1688 cc (103 cu in) air-cooled v2, four-stroke architecture with road-focused gearing. In factory specification, maximum torque reaches 135.6 Nm (100 lb-ft) at 3,250 rpm, transferring power to the rear wheel through a 6-speed gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 98.4 x 111.3 mm (3.9 x 4.4 inches) with a 9.6:1 compression ratio.
On the scales, the FLHR Road King measures 368.3 kg (812 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 673 mm (26.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,613 mm (63.5 in) wheelbase engineered for planted straight-line stability. The 22.71-liter (6 US gal) fuel tank paired with a rated consumption of 5.6 L/100 km provides an estimated theoretical range of roughly 406 km (252 miles) between fill-ups.
Within MotoLibrary's Harley-Davidson archive, this model family spans 10 indexed model years from 2000 to 2012, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Theoretical Range
~406 km (252 mi)
Engine
Displacement1688.0 ccm (103.00 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsAir-cooled Twin Cam 103™ with Integrated Oil-Cooler. Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters;
Torque135.6 Nm (13.8 kgf-m or 100.0 ft.lbs) @ 3250 RPM
Compression9.6:1
Bore x Stroke98.4 x 111.3 mm (3.9 x 4.4 inches)
Valves/Cylinder2
Fuel SystemInjection. Electronic Sequential Port Fuel Injection (ESPFI)
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
LubricationPressurized, dry-sump with oil cooler
CoolingAir
Transmission
Gearbox6-speed
Final DriveBelt (final drive)
ClutchMulti-plate with diaphragm spring in oil bath
DrivelinePrimary Drive Chain, 34/46 ratio Final Drive Belt, 32/68 ratio
Performance
Fuel Consumption5.60 litres/100 km (17.9 km/l or 42.00 mpg)
Greenhouse Gases129.9 CO2 g/km. (CO2 - Carbon dioxide emission)
ExhaustChrome, 2-1-2 dual exhaust with tapered mufflers
Chassis
Frame TypeMild steel; tubular frame; two-piece stamped and welded backbone; cast and forged junctions; twin downtubes; bolt-on rear frame with forged fender supports; MIG welded
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
