The RS4 125 – the first Aprilia sport bike in this engine class with a 4-stroke engine allow young enthusiasts to take advantage of the maximum levels of technological innovation, chassis efficiency, active safety and component quality. They belong – not only from a styling point of view – to the same range of extremely high performance Italian motorcycles in which the Aprilia RSV4 stands out, the extraordinary bike which conquered two world titles in the 2010 Superbike season.
It is precisely in the youngest classes of Moto GP that Aprilia established itself as a true “school of champions”. On Aprilia 250 and 125 bikes in the RS series (RS, RSV, RSW and RSA) riders such as Biaggi, Rossi, Melandri, Stoner, Lorenzo rode to their first great triumphs.
From 1993 until today, more than 100,000 Aprilia RS 125 two stroke bikes have been manufactured and sold in more than 30 countries around the world.
The Aprilia RS4 125 is the natural successor and most advanced evolution to date of the Aprilia RS 125, the bike that has dominated the 125 cc sports class for years, which set the benchmark for the one-eighth litre sports segment and which is still today the most highly sought after vehicle among riders competing in the Sport Production category.
Aprilia RS4 125 introduces the highly advanced, all-new four stroke powerplant to the sports segment, while adopting styling and technical solutions inherited from the RSV4, the superbike that led Aprilia to victory in the WSBK 2010 championship.
The livery and eye-catching forms of the Aprilia RS4 125 echo the looks of the Factory version of the Aprilia RSV4 supersports bike. And the RS4 shares more than just a family resemblance with the most hardcore street version the bike dominating the world SBK championship.
The Aprilia RS4 is powered by an all new 125 cc water cooled 4 stroke single cylinder engine with four valves and electronic engine boasting a sophisticated double overhead camshaft (DOHC) valve timing system. This engine produces the maximum power output permitted for the class with a smooth, linear delivery and ecologically – as it meets even the strictest emissions regulations in effect.
With a six speed gearbox allowing the rider to make full use of the power available in all conditions, the Aprilia RS4 125 offers unbeatable performance in its class not just in terms of absolute power at high engine speeds, but also in terms of usable power band, minimised vibration and outstanding mechanical reliability.