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MotoLibrary Score
31/100Commuter
Power/Weight
0.04 hp/kg
Torque
3 Nm
Engine
50 ccm
Technical Overview
2021 Um Chill 50 Technical Analysis & Specification Breakdown
Built around Um's scooter motorcycle platform, the 2021 Um Chill 50 utilizes a 49.6 cc (3 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 3.8 HP (2.8 kW) at 7,500 rpm while maximum torque reaches 2.8 Nm (2.1 lb-ft) at 6,000 rpm, transferring power to the rear wheel through a automatic gearbox. Internal engine geometry specifies a bore and stroke of 40.0 x 39.2 mm (1.6 x 1.5 inches) with a 9.2:1 compression ratio.
On the scales, the Chill 50 measures 91 kg (201 lbs) dry. Rider ergonomics and chassis geometry center around a 725 mm (28.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,330 mm (52.4 in) wheelbase engineered for quick, flickable steering geometry. The 5-liter (1.3 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Power Band Window
6,000–7,500 rpm
Standover Height
725 mm (28.5 in)
Engine
Displacement49.6 ccm (3.03 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power3.8 HP (2.8 kW)) @ 7500 RPM
Torque2.8 Nm (0.3 kgf-m or 2.1 ft.lbs) @ 6000 RPM
Compression9.2:1
Bore x Stroke40.0 x 39.2 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor. Mikuni EFI
IgnitionECU
CoolingAir
Transmission
GearboxAutomatic
Performance
Emission DetailsEuro 4
Chassis
Front SuspensionTelescopic fork
Rear SuspensionDouble Shock Absorber
Wheelbase1330 mm (52.4 inches)
Wheels & Brakes
Front Tyre110/70-12
Rear Tyre120/70-12
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight91.0 kg (200.6 pounds)
Power/Weight0.0415 HP/kg
Seat Height725 mm (28.5 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.
