Built around Hyosung's trial motorcycle platform, the 2009 Hyosung RX 125D-E features a 124 cc (7.6 cu in) oil & air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 13 HP (9.5 kW) at 10,000 rpm, 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-E measures 120 kg (265 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (9.23 kg per horsepower). Rider ergonomics and chassis geometry center around a 850 mm (33.5 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,425 mm (56.1 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 (9.23 kg/HP)
Standover Height
850 mm (33.5 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)) @ 10000 RPM
Valves/Cylinder4
Fuel SystemCarburettor
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingOil & air
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionUpside-down forks
Rear SuspensionMonoshock
Wheelbase1425 mm (56.1 inches)
Ground Clearance295 mm (11.6 inches)
Wheels & Brakes
Front Tyre2.75-21
Rear Tyre4.10-18
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight120.0 kg (264.6 pounds)
Power/Weight0.1083 HP/kg
Seat Height850 mm (33.5 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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
