At the heart of the 2009 Aprilia RS 50 sport motorcycle, Aprilia pairs a 49.9 cc (3 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 39.9 x 40.0 mm (1.6 x 1.6 inches) with a 11.5:1 compression ratio.
Rider ergonomics and chassis geometry center around a 1,310 mm (51.6 in) wheelbase engineered for quick, flickable steering geometry. The 13-liter (3.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Aprilia archive, this model family spans 15 indexed model years from 1998 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Engine
Displacement49.9 ccm (3.04 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Compression11.5:1
Bore x Stroke39.9 x 40.0 mm (1.6 x 1.6 inches)
Fuel SystemCarburettor. Dell’Orto PHVA - Ø14
IgnitionElettronica C.D.I.
LubricationAutomatic mixer
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMulti-plate
Performance
ExhaustEuro 2
Chassis
Frame TypeAluminium twin beam frame with extruded profiles and internal reinforcement
Front Suspension40 mm upside down fork
Front Travel120 mm (4.7 inches)
Rear SuspensionDouble reinforced member aluminium swingarm with bracing arch
Rear Travel110 mm (4.3 inches)
Wheelbase1310 mm (51.6 inches)
Wheels & Brakes
Front Tyre110/80-17
Rear Tyre130/70-17
Front BrakesSingle disc
Front Brake Ø300 mm (11.8 inches)
Rear BrakesSingle disc
Rear Brake Ø180 mm (7.1 inches)
Dimensions & Weight
Overall Length1965 mm (77.4 inches)
Overall Width720 mm (28.3 inches)
Fuel Capacity13.00 litres (3.43 US gallons)
Other
StarterElectric
Color OptionsAprilia Black, Fluo Red, Replica Spain´s n.1
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.
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.
