2010 Aprilia RX 50-SX 50
The Aprilia RXV and SXV were the first
bikes in the world to break the ‘single cylinder’
taboo and install a high performance twin in enduro
and supermotard motorcycles. At the time it was seen
as an almost impossible challenge to develop an off-road
twin that would still be accessible to the riding
public. But Aprilia’s R&D had the conviction,
determination and experience for the job, and victories
in top level competitions soon came flooding in, followed
by the world supermotard championship title.
But at Aprilia, we have never been
satisfied to rest on our laurels. We see racing as
the most effective method of testing new ideas and
solutions that we can then introduce across the range,
from our flagship model to our 50 cc machines.
The new babies in the Aprilia range,
the RX and the SX, are inspired by Aprilia’s
world-beating off road twins. The RX 50 and SX 50
are clearly dedicated to young riders seeking the
best technology around plus head-turning good looks.
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.
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
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.
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.
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.