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The Aprilia SX 125 draws inspiration from the innovative SXV and RXV models. The motorcycle was especially designed for the young riders who search for a rugged bike which is ready to cope with both city and off-road riding.

The SX 125 sits on 17 inch wheels shod in sport tires and is built on a strong frame. Power comes from a single cylinder unit developed using Aprilia’s experience in motorcycle racing. One of the unique features of the engine is its cylinder which is made of nickel silicon carbide (Nikasil) liner. Lubrication is provided by a separate mixer system.

The stopping power is handled by a front 260 mm disc and a two-piston floating caliper and a rear 220 mm disc combined with another floating piston.

On the other hand, the suspension includes a 40 mm upside down telescopic fork and a rear long steel swingarm.

Hit the jump for more information on the Aprilia SX 125.

  • 2012 Aprilia SX 125
  • Year:
  • Make:
  • Model:
  • Engine:
    Single cylinder, two-stroke
  • Horsepower @ RPM:
  • Torque @ RPM:
    12 @ 9750
  • Energy:
    Carburettor. Dell’Orto VHST 28
  • Displacement:
    122.00 cc
  • Top Speed:
    71 mph

Press Release


2012 Aprilia SX 125 High Resolution Exterior
- image 438711

The single cylinder unit that powers these Aprilia 125 cc motorcycles is a state-of-the-art two stroke engine. It is a classic example of how race-developed technology can deliver extremely low emissions as well as top performance. On the RX 125 and SX 125, Aprilia has succeeded in perfecting its two stroke design to bring it in line with the strict new Euro 3 standard without any loss of performance or riding satisfaction. This sparkling single cylinder engine easily develops the maximum permitted power for its class, with all the lightness and zippy acceleration typical of a high performance two stroke.
This engine has already established a place for itself in the hearts of 125 fans, thanks to its many advanced characteristics, including liquid cooling, and a balancer shaft. The cylinder has a nickel silicon carbide (Nikasil) liner for an ultra-reliable, extended life. Lubrication is provided by a separate mixer system.


2012 Aprilia SX 125 Exterior
- image 438715

Aprilia was the first manufacturer to introduce dramatic innovations to the designs of essential enduro and motard motorcycles. In the same way in which the RXV and SXV have become style icons in their own right, the SX and RX are destined to leave their mark on young off-road riders.
As with all off road motorcycles worthy of respect, the SX and RX are built for maximum functionality and efficient riding and control. Their styling leaves no room for pointless frills and gadgets. The unmistakably pure lines of the SX and RX are simply unique among off-roaders.

Brakes and Suspension

2012 Aprilia SX 125 Exterior
- image 438718

Active safety on the Aprilia RX and SX is ensured by advanced suspension and a braking system that sets new standards for stopping power and progressive action. The front brakes feature a 260 mm disc and two-piston floating caliper while the back brake incorporates a 220 mm disc and another floating piston.
The robust, steel, double cradle frame is coupled to an over-sized suspension system. At the front is a mighty, 40 mm upside down telescopic fork offering wheel travel of 260 mm.
At the back, a long steel swingarm delivers maximum traction and a rear wheel travel of 270 mm.


2012 Aprilia SX 125 Exterior
- image 438721

Specialist motorcycles like the RX and SX demand top level components, especially wheels, the strength and lightness of which are so important to handling. The Aprilia RX and SX are equipped with prestigious spoked wheels with new black anodised rims. Just like top sports motards, the SX boasts lightweight 17 inch, wide profile wheels and generous sports tyres, 110/70-17” and 150/60-17” for maximum grip under all conditions.


2012 Aprilia SX 125 Exterior
- image 438714

To confirm its determination to build advanced motorcycles that are versatile and practical in everyday use, Aprilia has equipped the RX and SX with sophisticated digital instruments just like those on the bigger SXV and RXV.
Once again Aprilia motorcycles are going to feature in the dreams of young riders.


2012 Aprilia SX 125 High Resolution Exterior
- image 438712
Engine Rotax 122 single cylinder 2-stroke. Aluminium cylinder with Nikasil liner.
Fuel Unleaded petrol.
Bore x Stroke 54mm 54,5mm
Total displacement 124,8cc
Compression ratio 12,5:1
Maximum power at the crank 11 kW and 16 kW
Maximum torque at the crank 12.2 Nm @ 8000 rpm (11 kW) and 16 Nm @ 9750 rpm (16 kW).
Fuel system Dell’Orto VHST 28 carburettor.
Ignition Electronic CDI ignition.
Starting Kick start.
Generator 12V-180W
Lubrification Separate mixing with variable displacement, volumetric pump.
Gear box 6 speed. Ratios 1st 10/30 2nd 14/29 3rd 17/27 4th 19/25 5th 21/23 6th 22/21
Clutch Multi-plate wet clutch.
Primary drive Helical gears. Ratio: 19/63.
Final drive Chain. Z 16 gearbox pinion, Z 45 rear wheel sprocket (11 kW); Z 15 gearbox pinion, Z 45 rear wheel sprocket (16 kW).
Frame High strength steel frame with double trellis beam and double cradle. Detachable seat frame.
Front suspension 40 mm upside down hydraulic fork. Wheel travel 260 mm.
Rear suspension Steel swingarm. Hydraulic monoshock with piggy back cylinder. Wheel travel 270 mm.
Brakes Front brake 260 mm disc. Floating caliper with two parallel pistons. Rear brake 220 mm disc. Floating caliper with single piston.
Wheels Front wheel Aluminium, 3.00x17”. Rear wheel Aluminium, 4.25x17”.
Tyres Front tyre Pirelli Diablo, 110/70x17”. Rear tyre Pirelli Diablo, 150/60x17”.
Dimensions Overall length 2,165 mm. Overall width (at brake levers) 850 mm. Overall height (at mirrors) 1,390 mm. Seat height 870 mm. Wheelbase 1,480 mm.
Dry weight 115Kg
Fuel tank capacity 10 litres (including 1.3 litres reserve).
Cooling Liquid cooled.
Intake Reed valve.
Maximum speed 115 kph (11 kW); 120 kph (16 kW).
Emissions Euro 3 (11 kW and 16 kW).
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