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MotoLibrary Score
34/100Commuter
Power/Weight
0.09 hp/kg
Torque
9 Nm
Engine
125 ccm
Technical Overview
2021 Um Duramax 125 Technical Analysis & Specification Breakdown
Engineered by Um for the sport motorcycle segment, the 2021 Um Duramax 125 pairs a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 10.5 HP (7.7 kW) at 8,600 rpm while maximum torque reaches 8.9 Nm (6.6 lb-ft) at 7,200 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 84 HP per liter and a 1,400 rpm working window between peak torque (7,200 rpm) and peak power (8,600 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 Duramax 125 measures 112 kg (247 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (10.67 kg per horsepower). Rider ergonomics and chassis geometry center around a 745 mm (29.3 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops. The 10.22-liter (2.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
84 HP/L
Power-to-Weight
0.09 HP/kg (10.67 kg/HP)
Power Band Window
7,200–8,600 rpm
Standover Height
745 mm (29.3 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power10.5 HP (7.7 kW)) @ 8600 RPM
Torque8.9 Nm (0.9 kgf-m or 6.6 ft.lbs) @ 7200 RPM
Compression9.2:1
Bore x Stroke56.5 x 49.5 mm (2.2 x 1.9 inches)
Fuel SystemCarburettor
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionCDI
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionTelescopic Fork
Rear SuspensionHydraulic With Spring
Ground Clearance125 mm (4.9 inches)
Wheels & Brakes
Front Tyre2.75-18
Rear Tyre110/90-16
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight112.0 kg (246.9 pounds)
Power/Weight0.0941 HP/kg
Seat Height745 mm (29.3 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.
