Positioned in Honda's allround motorcycle lineup, the 2015 Honda TMX 125 Alpha features a 124.1 cc (7.6 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 9.7 HP (7.1 kW) at 8,000 rpm while maximum torque reaches 9.4 Nm (6.9 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 78.2 HP per liter and a 1,500 rpm working window between peak torque (6,500 rpm) and peak power (8,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the TMX 125 Alpha measures 108 kg (238 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (11.13 kg per horsepower). Rider ergonomics and chassis geometry center around a 771 mm (30.4 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,306 mm (51.4 in) wheelbase engineered for quick, flickable steering geometry. The 8.6-liter (2.3 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Honda archive, this model family spans 2 indexed model years from 2015 to 2022, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
78.2 HP/L
Power-to-Weight
0.09 HP/kg (11.13 kg/HP)
Power Band Window
6,500–8,000 rpm
Standover Height
771 mm (30.4 in)
Engine
Displacement124.1 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power9.7 HP (7.1 kW)) @ 8000 RPM
Torque9.4 Nm (1.0 kgf-m or 6.9 ft.lbs) @ 6500 RPM
Bore x Stroke56.5 x 49.5 mm (2.2 x 1.9 inches)
Fuel SystemCarburettor
Fuel ControlOverhead Valves (OHV)
IgnitionAC-CDI
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
DrivelineConstant mesh
Chassis
Front SuspensionTelescopic Fork
Rear SuspensionTwin shocks
Wheelbase1306 mm (51.4 inches)
Ground Clearance163 mm (6.4 inches)
Wheels & Brakes
Front Tyre80/100-18
Rear Tyre90/90-18
Front BrakesExpanding brake (drum brake)
Rear BrakesExpanding brake (drum brake)
WheelsSpoke
Dimensions & Weight
Dry Weight108.0 kg (238.1 pounds)
Power/Weight0.0895 HP/kg
Seat Height771 mm (30.4 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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
