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Don’t be duped into thinking that the Aprilia SX 50 is a lightweight on two wheels. On the contrary, this bike, while clearly dedicated to young riders seeking the best technology around matched with head-turning good looks, is one that’s been designed with high-performance capabilities that few bikes in its segment can compete with. You certainly don’t expect anything less from Aprilia, a company that has taken the task of building the most efficient bikes in the market, whether it’s 50cc machines or their flagship models.

The SX 50, in particular, draws from years of innovation and expertise on 50cc bikes. The design offers sharp, clear-cut lines that are derived directly from the RXV/SXV off-road style icons, a testament to the enduring design of Aprilia bikes in all its forms. The SX 50 supermotard is also the epitome of a high-performance 50 cc machine, as evidenced by an advanced liquid cooled, single cylinder two stroke engine that uses the latest in single-cylinder technology, ensuring exceptional performance from a surprisingly low weight bike.

Find out more about the Aprilia SX 50 after the jump.

  • 2012 Aprilia SX 50
  • Year:
  • Make:
  • Model:
  • Engine:
    Single cylinder, two-stroke
  • Energy:
    Carburettor. Dell Ortho PVHA 17.5
  • Displacement:
    50 cc


2012 Aprilia SX 50 Exterior
- image 438949

The RX 50 enduro and SX 50 supermotard are high performance 50 cc machines. They are both powered by an engine of the latest generation and feature the sort of chassis that many big can only envy.

Don’t be fooled by the size of the 50 cc engine. The RX and SX are real motorcycles, and just at home on tough racing circuits as they are on the daily trip from home to school or college.

Their design speaks for itself. Their sharp, clear-cut lines derive directly from the RXV/SXV off-road style icons. Just as their bigger sisters before them, the RX and SX are on their way to create a whole new fashion in 50 cc styling.

Frame and Brakes

2012 Aprilia SX 50 Exterior
- image 438948

The new perimeter frame forms a direct connection between the steering head and the swingarm pivot, in line with the latest off-road developments. The frame is made from high strength steel to absorb all the stress that hard off-road riding can transmit. This synthesis of strength and lightness is the perfect match for the characteristics of the RX/SX 50. The suspensions are another one of the strong points of these exceptional motorcycles. At the front there is a mighty fork with 40 mm stanchions giving a wheel travel of 195 mm, more than enough to absorb even the hardest knocks. At the back, the high strength steel swingarm is damped by an advanced hydraulic monoshock giving a generous 180 mm of rear wheel travel to ensure that the RX/SX 50 can tackle even the toughest terrains.

The imposing front brake is abundantly over-sized to ensure safe, competition standard braking and stopping. The ventilated steel disc is 260 mm in diameter on the RX enduro and an amazing 300 mm in diameter on the SX motard, bigger than on any alternative 50 cc bike. The floating front caliper is a twin piston unit. The rear brakes are up to the job too, with a 180 mm stainless steel disc and a powerful caliper with two opposing pistons.


2012 Aprilia SX 50 High Resolution Exterior
- image 438950

The wheels are another essential part of any competition machine, and one of the most distinctive elements on these small off-road Aprilias. Aluminium has been adopted for its light weight and exceptional stress resistance. The RX is equipped with a 21” front wheel and an 18” rear wheel, just as on real competition enduro bikes. The SX is fitted with two 17” wheels with wide profile tyres for superb handling around town or on a twisting cart track.


2012 Aprilia SX 50 Exterior
- image 438899

Such an amazing chassis obviously demands an engine to match. That is why the RX and SX are powered by Aprilia’s advanced liquid cooled, single cylinder two stroke engine with reed valve induction. Use of the latest technology ensures that this new engine delivers exceptional performance from a surprisingly low weight (only 15 kg). Lubrication is provided by a separate mixing system, with a variable displacement volumetric pump. A kick start has been preferred to save weight. A six speed gearbox makes the best possible use of the power delivered by this impressive engine.

On top of all this the RX and SX also benefit from the sort of prestige components normally found only on far bigger bikes. The ultra-compact digital instruments feature an innovative design and perform a range of functions to keep all parameters under constant control. Twin headlights add another touch of personality and guarantee superior night-time visibility.
The long seat extends over the compact fuel tank to provide ample room for movement under sport riding conditions. Tank capacity is 7 litres. Considering the extremely limited fuel consumption of the 50 cc engine, the Aprilia RX 50 and SX 50 therefore have plenty of autonomy for all types of use.

Just like all Aprilia motorcycles, the RX and SX also respect nature: the exhaust is fitted with a catalytic converter, and emissions respect euro 2 standards without penalising the advanced performance of the Aprilia 50 cc engine.


2012 Aprilia SX 50 Exterior
- image 438897
Engine Liquid cooled, single cylinder two stroke with light alloy cylinder
Fuel Lead-free petrol
Bore x Stroke 39,88x40 mm
Total displacement 49,9 cc
Compression ratio 11,5:1
Fuel system DELL’ORTO PVHA 17.5 carburettor Fuel shut-off on tank
Ignition Electronic C.D.I
Starting Kick start
Exhaust Catalytic converter
Generator 85 W (120 W optional)
Lubrification Automatic mixer
Gear box 6 speed. Ratios: 1st 11/34 2nd 15/30 3rd 18/27 4th 20/24 5th 22/23 6th 23/22
Clutch Multi-plate
Primary drive Gears. Ratio: 21/78
Final drive Chain. Ratio: 11/53
Frame Steel beam
Front suspension 40 mm hydraulic fork with leading axle, wheel travel 195 mm.
Rear suspension High strength steel swingarm; Hydraulic monoshock; wheel travel 180 mm.
Brakes Front: 300 mm stainless steel disc; floating caliper Rear: 180 mm stainless steel disc; caliper with two opposing pistons
Wheels Spoked wheels with aluminium rim. Front: 2.50 X 17” Rear: 3.50 x 17”
Tyres Front: 110/80 - 17” Rear: 130/70 -17”
Dimensions Overall length: 2045 mm Overall width: 825 mm Seat height: 830 mm Wheelbase: 1406 mm
Fuel tank capacity 7 litres
Kirby Garlitos
Kirby Garlitos
Automotive Aftermarket Expert -
Kirby’s first exposure into the world of automobiles happened when he caught Knight Rider on television as a five-year old boy. David Hasselhoff didn’t leave much of an impression on him (that happened later on in Baywatch), but KITT certainly did. To this day, Kirby remains convinced that he will one day own a car with the same ‘spirit’ as the original KITT (not the 2008 monstrosity). He doesn't know when that will be, but until then, he’s committed to expressing his love for KITT, and all cars for that matter, here at TopSpeed.  Read full bio
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