Engineered by Hartford for the sport motorcycle segment, the 2008 Hartford HD125S pairs a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 12.7 HP (9.3 kW) at 8,200 rpm while maximum torque reaches 6.9 Nm (5.1 lb-ft) at 7,500 rpm, transferring power to the rear wheel through a 5-speed gearbox. With a specific output of 102.4 HP per liter and a 700 rpm working window between peak torque (7,500 rpm) and peak power (8,200 rpm), 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 HD125S measures 110 kg (243 lbs) dry, translating to a power-to-weight ratio of 0.12 HP/kg (8.66 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,280 mm (50.4 in) wheelbase engineered for quick, flickable steering geometry. The 10.3-liter (2.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
102.4 HP/L
Power-to-Weight
0.12 HP/kg (8.66 kg/HP)
Power Band Window
7,500–8,200 rpm
Standover Height
780 mm (30.7 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power12.7 HP (9.3 kW)) @ 8200 RPM
Torque6.9 Nm (0.7 kgf-m or 5.1 ft.lbs) @ 7500 RPM
Compression9.0:1
Bore x Stroke56.5 x 49.5 mm (2.2 x 1.9 inches)
Fuel SystemCarburettor
Fuel ControlOverhead Valves (OHV)
CoolingAir
Transmission
Gearbox5-speed
Chassis
Wheelbase1280 mm (50.4 inches)
Wheels & Brakes
Front Tyre2.75-18
Rear Tyre3.50-16
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight110.0 kg (242.5 pounds)
Power/Weight0.1157 HP/kg
Seat Height780 mm (30.7 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.
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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
