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MotoLibrary Score
34/100Commuter
Power/Weight
0.11 hp/kg
Torque
9 Nm
Engine
124 ccm
Technical Overview
2021 Um Max ZR Technical Analysis & Specification Breakdown
Engineered by Um for the sport motorcycle segment, the 2021 Um Max ZR relies on a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 10.7 HP (7.8 kW) at 8,500 rpm while maximum torque reaches 8.6 Nm (6.3 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 86.3 HP per liter and a 1,500 rpm working window between peak torque (7,000 rpm) and peak power (8,500 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 Max ZR measures 100 kg (220 lbs) dry, translating to a power-to-weight ratio of 0.11 HP/kg (9.35 kg per horsepower). Rider ergonomics and chassis geometry center around a 750 mm (29.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,250 mm (49.2 in) wheelbase engineered for quick, flickable steering geometry.
Specific Output
86.3 HP/L
Power-to-Weight
0.11 HP/kg (9.35 kg/HP)
Power Band Window
7,000–8,500 rpm
Standover Height
750 mm (29.5 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power10.7 HP (7.8 kW)) @ 8500 RPM
Torque8.6 Nm (0.9 kgf-m or 6.3 ft.lbs) @ 7000 RPM
Compression9.0:1
Bore x Stroke56.5 x 49.5 mm (2.2 x 1.9 inches)
Fuel SystemCarburettor. PZ25
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionCDI
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionHydraulic Telescopic Fork
Rear SuspensionHydraulic monoshock with spring
Wheelbase1250 mm (49.2 inches)
Wheels & Brakes
Front Tyre2.75-18
Rear Tyre3-18
Front BrakesExpanding brake (drum brake)
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight100.0 kg (220.5 pounds)
Power/Weight0.1072 HP/kg
Seat Height750 mm (29.5 inches) If adjustable, lowest setting.
Overall Height970 mm (38.2 inches)
Overall Length1900 mm (74.8 inches)
Overall Width735 mm (28.9 inches)
Other
StarterElectric & kick
Color OptionsRed, Black, Blue, Orange, Green, White
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.
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.
