Positioned in Derbi's scooter motorcycle lineup, the 2012 Derbi Sonar 50 2T features a 49.4 cc (3 cu in) air-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 4.6 HP (3.4 kW) at 7,250 rpm while maximum torque reaches 4.7 Nm (3.5 lb-ft) at 6,750 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 40.0 x 39.3 mm (1.6 x 1.5 inches) with a 10.9:1 compression ratio.
On the scales, the Sonar 50 2T measures 103 kg (227 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 795 mm (31.3 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,340 mm (52.8 in) wheelbase engineered for quick, flickable steering geometry. The 6-liter (1.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Derbi archive, this model family spans 3 indexed model years from 2010 to 2012, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Power Band Window
6,750–7,250 rpm
Standover Height
795 mm (31.3 in)
Engine
Displacement49.4 ccm (3.01 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power4.6 HP (3.4 kW)) @ 7250 RPM
Torque4.7 Nm (0.5 kgf-m or 3.5 ft.lbs) @ 6750 RPM
Compression10.9:1
Bore x Stroke40.0 x 39.3 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor
LubricationMechanical oil pump
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchAutomatic centrifugal
DrivelineAutomatic CVT
Chassis
Front SuspensionHydraulic fork.
Front Travel76 mm (3.0 inches)
Rear SuspensionSingle shock absorber
Rear Travel64 mm (2.5 inches)
Wheelbase1340 mm (52.8 inches)
Wheels & Brakes
Front Tyre90/80-16
Rear Tyre110/80-14
Front BrakesSingle disc
Front Brake Ø220 mm (8.7 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø140 mm (5.5 inches)
Wheels5-spoke black wheels
Dimensions & Weight
Dry Weight95.0 kg (209.4 pounds)
Weight incl.103.0 kg (227.1 pounds)
Power/Weight0.0484 HP/kg
Seat Height795 mm (31.3 inches) If adjustable, lowest setting.
Overall Length1960 mm (77.2 inches)
Overall Width735 mm (28.9 inches)
Fuel Capacity6.00 litres (1.59 US gallons)
Other
StarterElectric & kick
Color OptionsBlack, white
Carrying CapacityCompartment underthe seat to hold a jet helmet.
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.
