2018 Aprilia SR 50 R Technical Analysis & Specification Breakdown
Positioned in Aprilia's scooter motorcycle lineup, the 2018 Aprilia SR 50 R relies on a 49 cc (3 cu in) liquid-cooled single cylinder, two-stroke powerplant. Internal engine geometry specifies a bore and stroke of 40.0 x 39.3 mm (1.6 x 1.5 inches) with a 12.1:1 compression ratio.
Rider ergonomics and chassis geometry center around a 820 mm (32.3 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,290 mm (50.8 in) wheelbase engineered for quick, flickable steering geometry. The 7-liter (1.8 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Aprilia archive, this model family spans 14 indexed model years from 2007 to 2020, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
820 mm (32.3 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Compression12.1:1
Bore x Stroke40.0 x 39.3 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor
IgnitionCDI
LubricationSeparate mixing with mechanical oil pump
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchAutomatic centrifugal dry clutch
DrivelineGears in oil bath final drive
Performance
Emission DetailsEuro 2
Chassis
Frame TypeSplit single cradle frame in high tensile strength steel tube
Front SuspensionTelescopic hydraulic fork
Front Travel90 mm (3.5 inches)
Rear SuspensionEngine unit acting as swingarm. Monoshock.
Rear Travel70 mm (2.8 inches)
Wheelbase1290 mm (50.8 inches)
Wheels & Brakes
Front Tyre130/60-13
Rear Tyre130/60-13
Front BrakesSingle disc. 2 opposing pistons
Front Brake Ø190 mm (7.5 inches)
Rear BrakesSingle disc. 2 opposing pistons
Rear Brake Ø190 mm (7.5 inches)
WheelsFive spoke, light alloy wheels
Dimensions & Weight
Seat Height820 mm (32.3 inches) If adjustable, lowest setting.
Overall Height1120 mm (44.1 inches)
Overall Length1860 mm (73.2 inches)
Overall Width705 mm (27.8 inches)
Fuel Capacity7.00 litres (1.85 US gallons)
Other
StarterElectric
Color OptionsSilver/black/red
InstrumentsDigital dashboard
ElectricalGenerator: Flywheel-magneto, 70 W – 12 V
LightDual halogen headlights
Carrying CapacityStorage compartment in the seat nose
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.
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.
