2011 Aprilia SR 50 R Street Technical Analysis & Specification Breakdown
Positioned in Aprilia's scooter motorcycle lineup, the 2011 Aprilia SR 50 R Street utilizes a 49 cc (3 cu in) single cylinder, two-stroke layout. 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 6.5-liter (1.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Aprilia archive, this model family spans 4 indexed model years from 2009 to 2012, 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
Engine DetailsIntake: Reed valve
Compression12.1:1
Bore x Stroke40.0 x 39.3 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor. 17.5 mm throttle body
IgnitionCDI - capacitor discharge ignition
LubricationSeparate mixing with mechanical oil pump
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
Chassis
Frame TypeSplit single cradle frame in high tensile strength steel tube
Front SuspensionHydraulic fork
Front Travel90 mm (3.5 inches)
Rear SuspensionEngine unit acting as swingarm, secured to the frame by linkages on radial silent block mountings.
Rear Travel70 mm (2.8 inches)
Wheelbase1290 mm (50.8 inches)
Wheels & Brakes
Front Tyre130/60-13
Rear Tyre130/60-13
Front BrakesSingle disc
Front Brake Ø190 mm (7.5 inches)
Rear BrakesSingle disc
Rear Brake Ø190 mm (7.5 inches)
WheelsFive spoke light alloy wheels front and rear: 3.50 x 13´
Dimensions & Weight
Seat Height820 mm (32.3 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.
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.
