At the heart of the 2009 Derbi Atlantis City 50 4T scooter motorcycle, Derbi pairs a 49.9 cc (3 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 39.0 x 41.8 mm (1.5 x 1.6 inches) with a 11.5:1 compression ratio.
On the scales, the Atlantis City 50 4T measures 93 kg (205 lbs) dry. 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 1,265 mm (49.8 in) wheelbase engineered for quick, flickable steering geometry. The 7.1-liter (1.9 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Derbi archive, this model family spans 4 indexed model years from 2006 to 2009, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
795 mm (31.3 in)
Engine
Displacement49.9 ccm (3.04 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Compression11.5:1
Bore x Stroke39.0 x 41.8 mm (1.5 x 1.6 inches)
Fuel SystemCarburettor. 18 mm
LubricationSystem Oil pump
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchAutomated
Chassis
Front Suspension25 mm hydraulic fork.
Front Travel65 mm (2.6 inches)
Rear SuspensionMonoshock.
Rear Travel65 mm (2.6 inches)
Wheelbase1265 mm (49.8 inches)
Wheels & Brakes
Front Tyre130/60-13
Rear Tyre130/60-13
Front BrakesSingle disc
Front Brake Ø200 mm (7.9 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø110 mm (4.3 inches)
Dimensions & Weight
Dry Weight93.0 kg (205.0 pounds)
Seat Height795 mm (31.3 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.
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.
