Aprilia SX 125 - 2011 Specifications and Reviews

The 2011 Aprilia SX 125 is a lightweight supermotard designed for young riders and beginners seeking an agile, fun machine. Powered by a nimble 122cc Rotax two-stroke engine producing 21.4 horsepower, it excels in urban environments and tight trail riding with its compact frame and responsive handling. The liquid-cooled engine and 6-speed gearbox deliver spirited performance while remaining accessible and affordable for novice riders.

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General information

CategorySuper motard
Year2011
ModelAprilia SX 125

Engine and Transmission Specifications

ClutchMulti-plate wet clutch.
Transmission type,final driveChain
Gearbox6-speed
Cooling systemLiquid
Lubrication systemSeparate mixing with variable displacement, volumetric pump.
Fuel systemCarburettor. Dell' Orto VHST 28
Bore x stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Compression12.5:1
Top speed115.0 km/h (71.5 mph)
Torque16.00 Nm (1.6 kgf-m or 11.8 ft.lbs) @ 9750
Power21.45
Engine detailsRotax 122 engine. Aluminium cylinder with Nikasil liner.
Engine typeSingle cylinder, two-stroke
Capacity:122.00 ccm (7.44 cubic inches)
 
 

Brakes, suspension, Frame and wheels

WheelsAluminium
Rear brakes diameter220 mm (8.7 inches)
Rear brakesSingle disc
Front brakes diameter260 mm (10.2 inches)
Front brakesSingle disc
Rear tyre dimensions150/60-17
Front tyre dimensions110/70-17
Rear suspensionSteel swingarm. Hydraulic monoshock with piggy back cylinder. Wheel travel 270 mm.
Front suspension40 mm upside down hydraulic fork. Wheel travel 260 mm.
Frame typeHigh strength steel frame with double trellis beam and double cradle. Detachable seat frame.
 
 

Physical measures and capacities

Reserve fuel capacity1.30 litres (0.34 gallons)
Fuel capacity10.00 litres (2.64 gallons)
Wheelbase1,480 mm (58.3 inches)
Overall width850 mm (33.5 inches)
Overall length2,165 mm (85.2 inches)
Seat height830 mm (32.7 inches) If adjustable, lowest setting.
Power/weight ratio0.1865 HP/kg
Dry weight115.0 kg (253.5 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
Color optionsBlack
ElectricalGenerator: 12V-180W
StarterKick

Performance Profile & Rider Fit

14.8 hp
Peak Power
71.5 mph
Top Speed

Best For

Track30%
City85%
Cornering80%
Daily Riding65%
Touring20%
Passenger25%

Rider Profile

Best ForThis bike suits new and younger riders, including those on a learner or A1-equivalent licence, who want a light, approachable machine to build confidence on.
PurposeIt's built as a nimble supermoto-styled commuter for weaving through city traffic and having fun on twisty back roads rather than for outright speed.
Rider FitIts low weight and tall but slim seat make it easy to manage at a stop for shorter or less experienced riders, though the 880mm seat height requires reasonable inseam length.
CharacterPlayful, flickable, and eager to be thrown around corners, it rewards an energetic riding style over long-distance cruising.
Not Ideal ForIt's not the right choice for riders wanting highway speed, long motorway touring comfort, or serious off-road capability.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2011 Aprilia SX 125 Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 830mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with balls of both feet on the 2011 Aprilia SX 125, with a relaxed knee angle of around 130 degrees and a forward-leaning riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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