Comparison of Aprilia SR 50 R Street 2011 and Piaggio Liberty Catalyzed 2007

Attribute	Piaggio Liberty Catalyzed 2007 ×	Aprilia SR 50 R Street 2011 ×
General
Production from (year)	2007	2011
Make	Piaggio	Aprilia
Model	Piaggio Liberty Catalyzed	Aprilia SR 50 R Street
Category	Scooter	Scooter
Engine and transmission
Engine type	Single cylinder, two-stroke	Single cylinder, two-stroke
Fuel system	Carburettor	Carburettor. 17.5 mm throttle body
Engine details	-	Intake: Reed valve
Displacement (cm³)	49.4	49
Power (kw)	7.3	-
Cooling system	Air	-
Transmission type,final drive	Belt	Belt
Torque (Nm)	10.2	-
Bore (mm)	40	40
Stroke (mm)	39.3	39.3
Gearbox	Automatic	Automatic
Ignition	Inductive	CDI - capacitor discharge ignition
Clutch	Dry automatic centrifugal type	-
Lubrication system	Wet sump	Separate mixing with mechanical oil pump
Compression	10.3:1	12.1:1
Chassis
Front suspension	Telescopic fork	Hydraulic fork
Rear suspension	Hydraulic monoshock	Engine unit acting as swingarm, secured to the frame by linkages on radial silent block mountings.
Front brakes	Single disc	Single disc
Rear brakes	Expanding brake (drum brake)	Single disc
Diameter (mm)	140	190
Frame type	-	Split single cradle frame in high tensile strength steel tube
Front tyre	90/80-16	130/60-13
Rear tyre	110/80-14	130/60-13
Wheels	-	Five spoke light alloy wheels front and rear: 3.50 x 13´
Front wheel travel (mm)	76	90
Rear wheel travel (mm)	83	70
Other
Starter	Electric & kick	Electric
Color options	-	black grey
Dimensions
Wheelbase (mm)	1,330	1,290
Dry weight (kg)	87	-
Power/weight ratio	0.0839	-
Overall length (mm)	1,900	1,860
Seat height (mm)	775	820
Performance
Fuel capacity (l)	6	6.5