aprilia RS4 50



The Aprilia RS4 50 is for budding bikers, those who prefer the real emotions of a motorbike, the knowledge of mechanics and riding pleasure to the virtual world of social networks. For them Aprilia has created the RS4 50, a real bike, designed with the same care and professionalism as the larger engine capacity bikes. Because the first bike is the most important of all and Aprilia knows it well. Also the small Aprilia RS4 50, as its bigger 125 sister, recalls - both in the livery as well as in the importance of the shapes - the appearance of the Aprilia RSV4 super sports bike, starting from its extremley sport-like fairing. Accomplice the triple headlight, a distinguishing feature of all Aprillia sports products, the racing graphics, the exposed frame and also the compact tail, true work of art in design which optimally integrates the LED tail light. Also the exhaust system is spectacular, racing-inspired and fully integrated in the lower part of the fairing 

The 50cc single cylinder engine developed by Aprilia for the RS4 50 is a two-stroke, liquid cooled engine with reed intake valve. Lubrication is with seperate mixing with variable displacement volumetric pump. The six-speed gearbox make the most of the performance of an engine at the top of its class, a little pest ready to face any challange.

Also the RS50 has an analogue/digital multifuction dashoard inspired by that of the RSV4, with analogue rev counter and LCD Screen for all other information, from the speedometer to information on the parameters of its small but generous 50cc engine

An extremely refined feature of the RS4 50 is the passenger seat. The transformation from a two-seater to a single-seater takes place without the complicated removal of screws but only via a quick release/ attachment button that allows the passanger seat to be replaced with the tail cover (available as accessory) in seconds. Under the saddle, moreover, there is space for a practical storage compartment, the largest in the category.

The frame is undoubtedly the flagship of the RS4 project: created based on the exceptional experience acquired by Aprilia in the WSBK and in the 125 and 250 classes of the MotoGP, it adopts die-cast beams in aluminum alloy with cross-ribbing reinforcement. A lightweight structure, able to offer high torsional rigidity and wich stands out for its avant-garde design.

Safety is never enough and this is why the RS4 50 has a braking system definitely oversized for a 50cc. The front has a 300 mm disk brakeand worls in unsion with the four-piston radial mount caliper, while the rear is 220 mm. To enhance the exceptional riding characteristics of the RS4 125, sports tyres in terms of selcetion and footprint have been selected: 1800/80 at the front and 13/70 at the rear

Engine Type

Aprilia single - cylinder, two stroke.

Displacement CC


Bore X Stroke

39.86 x 40 mm

Compression Ratio


Fuel Tank Capacity

14.5 litres 3.5 litre reserve



Transmission Type

6 Ratios

Dimensions LxWxH

953 mm x 740 mm x 1,138 mm


1,350 mm

Seat Height

820 mm

Tyre Size Front

100/80 - 17

Tyre Size Rear

130/70 - 17

Brakes Type Front

300 mm stainless steel disc with radial 4 piston calliper

Brakes Type Rear

218 mm stainless steel disc and calliper with single 30 mm piston