What category is the 2011 Derbi Sonar 125 4T?

The 2011 Derbi Sonar 125 4T has a Category of Scooter.

What is the engine size of the 2011 Derbi Sonar 125 4T?

The 2011 Derbi Sonar 125 4T has a Capacity: of 124.00 ccm (7.57 cubic inches).

What type of engine does the 2011 Derbi Sonar 125 4T have?

The 2011 Derbi Sonar 125 4T has a Engine type of Single cylinder, four-stroke.

What is the engine power of the 2011 Derbi Sonar 125 4T?

The 2011 Derbi Sonar 125 4T has a Power of 10.60.

What is the torque of the 2011 Derbi Sonar 125 4T?

The 2011 Derbi Sonar 125 4T has a Torque of 9.60 Nm (1.0 kgf-m or 7.1 ft.lbs) @ 7250.

Is the 2011 Derbi Sonar 125 4T air cooled or liquid cooled?

The 2011 Derbi Sonar 125 4T has a Cooling system of Air.

How many gears does the 2011 Derbi Sonar 125 4T have?

The 2011 Derbi Sonar 125 4T has a Gearbox of Automatic.

How much does the 2011 Derbi Sonar 125 4T weigh?

The 2011 Derbi Sonar 125 4T has a Dry weight of 99.0 kg (218.3 pounds).

What is the seat height of the 2011 Derbi Sonar 125 4T?

The 2011 Derbi Sonar 125 4T has a Seat height of 805 mm (31.7 inches) If adjustable, lowest setting..

Derbi Sonar 125 4T - 2011 Specifications and Reviews

Name: 2011 Derbi Sonar 125 4T
Brand: Derbi

The 2011 Derbi Sonar 125 4T is an entry-level automatic scooter designed for urban commuters and novice riders seeking affordable, practical transportation. Powered by a modest 124cc single-cylinder four-stroke engine delivering 10.6 horsepower, it prioritizes fuel efficiency and reliability over performance. Known for its simplicity, low maintenance requirements, and ease of use, this scooter excels in city riding and daily commuting.

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General information
Category	Scooter
Year	2011
Model	Derbi Sonar 125 4T

Engine and Transmission Specifications
Emission details	Compartment underthe seat to hold a jet helmet.
Clutch	Automatic centrifugal
Transmission type,final drive	Belt
Gearbox	Automatic
Cooling system	Air
Lubrication system	Mechanical oil pump
Fuel system	Carburettor
Bore x stroke	57.0 x 48.6 mm (2.2 x 1.9 inches)
Compression	10.6:1
Torque	9.60 Nm (1.0 kgf-m or 7.1 ft.lbs) @ 7250
Power	10.60
Engine type	Single cylinder, four-stroke
Capacity:	124.00 ccm (7.57 cubic inches)
Brakes, suspension, Frame and wheels
Rear brakes diameter	140 mm (5.5 inches)
Rear brakes	Expanding brake (drum brake)
Front brakes diameter	220 mm (8.7 inches)
Front brakes	Single disc
Rear tyre dimensions	110/80-14
Front tyre dimensions	90/80-16
Rear suspension travel	64 mm (2.5 inches)
Rear suspension	Monoshock
Front suspension travel	76 mm (3.0 inches)
Front suspension	32 mm fork.
Physical measures and capacities
Fuel capacity	6.00 litres (1.59 gallons)
Wheelbase	1,325 mm (52.2 inches)
Overall width	740 mm (29.1 inches)
Overall length	1,930 mm (76.0 inches)
Seat height	805 mm (31.7 inches) If adjustable, lowest setting.
Power/weight ratio	0.1071 HP/kg
Dry weight	99.0 kg (218.3 pounds)
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Color options	White, red, black
Starter	Electric

Performance Profile & Rider Fit

10.6 hp

Peak Power

Best For

Track5%

City80%

Cornering35%

Daily Riding75%

Touring15%

Passenger30%

Rider Profile

Best For	Suitable for beginners and learner riders due to its small displacement, automatic transmission, and gentle power delivery.
Purpose	Designed primarily for short urban commutes and light everyday errands rather than performance or long-distance riding.
Rider Fit	Its low seat height and light dry weight make it accessible to riders of most heights and modest strength.
Character	A practical, low-maintenance 125cc automatic scooter that prioritizes ease of use and city convenience over excitement.
Not Ideal For	Not suitable for highway touring, spirited cornering, or off-road use given its low power and scooter chassis.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2011 Derbi Sonar 125 4T Rider Ergonomics Assessment

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Inseam (optional)

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Feet:

At 805mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2011 Derbi Sonar 125 4T, with a moderate knee angle of around 105 degrees and a slightly forward riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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