Engineered by Hyosung for the super motard motorcycle segment, the 2009 Hyosung RX 125D-SM relies on a 124 cc (7.6 cu in) oil & air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 13 HP (9.5 kW), transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 104.8 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the RX 125D-SM measures 123 kg (271 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (9.46 kg per horsepower). Rider ergonomics and chassis geometry center around a 840 mm (33.1 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,430 mm (56.3 in) wheelbase engineered for balanced agility and highway composure. The 8-liter (2.1 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
104.8 HP/L
Power-to-Weight
0.11 HP/kg (9.46 kg/HP)
Standover Height
840 mm (33.1 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power13.0 HP (9.5 kW))
Valves/Cylinder4
Fuel SystemCarburettor. BDS26
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingOil & air
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Wheelbase1430 mm (56.3 inches)
Ground Clearance275 mm (10.8 inches)
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre130/70-17
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight123.0 kg (271.2 pounds)
Power/Weight0.1057 HP/kg
Seat Height840 mm (33.1 inches) If adjustable, lowest setting.
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.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
