At the heart of the 2009 Hyosung RT 125D allround motorcycle, Hyosung pairs a 124 cc (7.6 cu in) oil & air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 13.5 HP (9.9 kW), transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 108.9 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 RT 125D measures 125 kg (276 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (9.26 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,350 mm (53.1 in) wheelbase engineered for quick, flickable steering geometry. The 8-liter (2.1 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
108.9 HP/L
Power-to-Weight
0.11 HP/kg (9.26 kg/HP)
Standover Height
790 mm (31.1 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power13.5 HP (9.9 kW))
Valves/Cylinder4
Fuel SystemCarburettor. BDS26
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingOil & air
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionTelescopic fork
Rear SuspensionMono shock absorber
Wheelbase1350 mm (53.1 inches)
Ground Clearance230 mm (9.1 inches)
Wheels & Brakes
Front Tyre130/80-18
Rear Tyre130/80-14
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight125.0 kg (275.6 pounds)
Power/Weight0.1080 HP/kg
Seat Height790 mm (31.1 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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
