Euro 2150. MSRP depends on country, taxes, accessories, etc.
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MotoLibrary Score
31/100Commuter
Top Speed
48 km/h
Engine
49 ccm
Technical Overview
1999 Aprilia Sonic Gp 50 Technical Analysis & Specification Breakdown
Positioned in Aprilia's scooter motorcycle lineup, the 1999 Aprilia Sonic Gp 50 utilizes a 49.3 cc (3 cu in) liquid-cooled single cylinder, two-stroke layout. Internal engine geometry specifies a bore and stroke of 40.0 x 39.2 mm (1.6 x 1.5 inches) with a 0.5:1 compression ratio.
On the scales, the Sonic Gp 50 measures 180 kg (397 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 770 mm (30.3 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,175 mm (46.3 in) wheelbase engineered for quick, flickable steering geometry. The 8-liter (2.1 US gal) fuel tank paired with a rated consumption of 99.99 L/100 km provides an estimated theoretical range of roughly 8 km (5 miles) between fill-ups, while factory top speed is listed at 48 km/h (30 mph).
Theoretical Range
~8 km (5 mi)
Engine
Displacement49.3 ccm (3.01 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Compression0.5:1
Bore x Stroke40.0 x 39.2 mm (1.6 x 1.5 inches)
Valves/Cylinder2
Fuel SystemCarburettor. Unleaded petrol according to Din 51607
IgnitionCDI
CoolingLiquid
Max RPM1800
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
Performance
Top Speed48.3 km/h (30.0 mph)
0-400m20.00 seconds
0-100 km/h20.00 seconds
Fuel Consumption99.99 litres/100 km (1.0 km/l or 2.35 mpg)
Greenhouse Gases2,319.8 CO2 g/km. (CO2 - Carbon dioxide emission)
ExhaustStainless steel pipe
Chassis
Frame TypeOne beam, split in two cradles
Front SuspensionHydrauliclly operated telescopic fork
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.
