BUT APRILIA SAYS....
The livery and eye-catching forms of the Aprilia RS4 50 and 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 design of the fairings and tank, the unique looks of the front end, with the headlights suspended over the gaping air intakes, and the spectacular tapered tail fairing are identical to their counterparts on V4 1000 cc supersports model that set new standards in terms of style and technical content for the superbike segment.
Extensive aerodynamic studies have minimised surface areas without compromising wind protection, and the fairings showcase the superlative mechanicals of the Aprilia RS4 50 and Aprilia RS4 125 rather than conceal them. As a result, the frame and engine are not hidden away but proudly flaunted as fundamental elements of the design of Aprilia's new small supersports models. With the triple headlight, the Aprilia RS4 bikes have a decidedly aggressive look that lends a unique character to the entire front end. The LED taillight merges stunningly into the ultra-compact tail fairing and offers excellent luminosity.
The fairing, product of extensive wind tunnel testing and race experience, offers excellent wind protection together with superb aerodynamic efficiency. And as well as contributing to the extremely aggressive looks of the bike, the top fairing and tail fairing also maximise performance in terms of speed. On Aprilia RS4 125, one additional detail underscores the level of sophistication of the bike: the exhaust, which is unmistakably inspired by competition machines, is completely integrated within the lower part of the fairing. A solution that is not just visually effective, but which also contributes significantly to the dynamics of the bike by helping to centralise masses.
With the new RS4 50 and RS4 125, Aprilia confirms its global leadership in the small capacity sports and young-targeted bike segment, creating models that exceed the expectations of even the most discerning rider.
The sophisticated chassis architecture of the Aprilia RS4 50 and RS4 125 is complemented by state of the art engines.
The single cylinder 50 cc unit developed by Aprilia for the RS4 50 is a water cooled two-stroke with reed valve induction. The lubrication uses a separate mixing system with a variable capacity volumetric pump. The six speed gearbox lets the rider make full use of the performance of this class beating engine.
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.
APRILIA QUICK SHIFT
For the first time on a 125 bike, Aprilia offers the innovative Aprilia Quick Shift system, a sophisticated technical solution derived directly from the extraordinary big sister, RSV4 APRC, which in turn is derived directly from Aprilia's experience in the World Superbike championship. The operational principle is similar, although partly simplified, to that of the RSV4: on the RS4 the system also guarantees torque interruption for gear change based on the speed which is engaged, the level of gas opening and the engine rpm, but for the 125cc, the shift time is a fixed parameter. The advantage of this system – available as a separate accessory - is that the rider can easily upshift keeping the gas open without using the clutch, thereby making the gear change simple and quick.
The chassis is without a doubt the feather in the RS4 project's cap: built based on the exceptional experience which Aprilia has gained in WSBK and the 125 and 250 classes in Moto GP, it uses die cast aluminium spars with crossed reinforcement ribs. With its state of the art design, this extremely lightweight structure offers high torsional stiffness.
The front suspension also boasts a class beating layout, with a sturdy 41 mm upside fork, black anodised stanchion clamps and a wheel travel of 110 mm, while at the rear is a monoshock linked directly to the asymmetric swingarm.
Both the Aprilia RS4 50 and RS4 125 boast class beating brake systems: each bike uses a 300 mm steel disc at the front, gripped by a four piston radial calliper, and a 220 mm disc at the rear with a single piston calliper.
The 17” wheels are shod with 100/80 rubber up front and a 130/70 tyre at the rear.
STANDARD EQUIPMENT AND FEATURES
The multifunctional analogue/digital instrument panel with LCD display draws directly from its big sister, the RSV4, while the design of the split 6-spoke design of the wheels further emphasises the purposeful character of Aprilia's latest small capacity sports bikes. The passenger saddle is yet another example of the extreme level of sophistication of these new bikes from Aprilia. Instead of fiddly screws, a practical quick release button allows the passenger seat to be exchanged with the tail fairing cover in an instant to transform the bike from two seat to single seat configuration (available as a separate accessory). Under the saddle there is also space for a practical glove-box, the most spacious in its category.
The new Aprilia RS4 50 and 125 are available in two colour schemes - “Racing Black” and “Racing White” - and in the bold “Replica SBK” livery which takes its colours from big sister, Aprilia RSV4 SBK, the bike with which Max Biaggi and the Aprilia Alitalia Racing Team conquered the rider and manufacturer titles in the 2010 World Superbike season.