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Aprilias small supersports bikes have been completely revised. Two models dedicated for young enthusiasts who want their first experience in the motorcycling world to be with a proper bike.

* Aprilia RS4 marked a milestone in the evolution of the 125 cc motorcycle.
* For the first time ever, the sportiest bike available for 16 year olds was a 4-stroke.
* For the youngest riders of all, the Aprilia RS 50 embodies all of Aprilias technology in a genuine racing replica in just 50 cc.

Aprilia has always been the undisputed leader in the 50 and 125 cc supersports segment, pioneering innovative concepts and solutions and setting trends for its rivals to follow.

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 machine among riders competing in the Sport Production category.

Aprilia RS4 125 introduces the highly advanced, all-new 4 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 most significant characteristics of the Aprilia RS 50 and Aprilia RS4 are:

* RS4 125 - single cylinder liquid cooled 125 cc 4-stroke with electronic injection, 4 valves and double overhead camshafts (DOHC)

characteristics in common:

* extremely stiff aluminium perimeter frame derived from racing experience
* 41 mm upside down fork
* front brake with 300 mm disc and radial four piston calliper
* Superbike inspired analogue/digital instrument panel
* fairings derived directly from RSV4 project for total aesthetic coherence with the SBK world champion

DESIGN

The livery and eye-catching forms of the Aprilia RS 50 and RS4 125 echo the looks of the Factory version of the Aprilia RSV4 supersports bike. And the RS 50 and RS4 125 share 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 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 RS 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 Aprilias new small supersports models. With the triple headlight, the Aprilia RS 50 and RS4 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. Even from behind, the Aprilia RS4 125 is absolutely unmistakable.

The product of extensive wind tunnel testing and race experience, the fairing 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.

ENGINES

With the new RS 50 and RS4 125, Aprilia confirms its global leadership in the small capacity sports bike segment, creating models that exceed the expectations of even the most discerning rider.

The sophisticated chassis architecture of the Aprilia RS 50 and RS4 125 is complemented by state of the art engines.
The single cylinder 50 cc unit developed by Aprilia for the RS 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 state of the art 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 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.

The product of a cutting edge design, the new single cylinder 125 cc unit features dry sump lubrication making it extremely light and compact, allowing Aprilias engineers to develop a class beating chassis layout.

CHASSIS

The RS 50 and RS4 125 stand head and shoulders above the competition for their superlative chassis layout: developed on the basis of Aprilias outstanding successes in WSBK and GP 125, the frame consists of die cast aluminium spars with crossed reinforcement ribs. With its state of the art design, this extremely lightweight structure offers exceptional torsional stiffness.
The front suspension also boasts a class beating layout, with a sturdy 41 mm upside fork, red 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 RS 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 Aprilias experience in the Superbike class. The split 6-spoke design of the wheels further emphasises the purposeful character of Aprilias latest small capacity sports bikes.

On Aprilia RS4, 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.

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

The dream of many Boxer fans has come true: With the new BMW HP2 Sport, BMW Motorrad is putting the sportiest, most

The BMW HP Sport is the lightest Boxer series of all times on the road. The third model of the HP model range was designed for the ambitious sports rider and enthralls with numerous exclusive details that were previously restricted to racing, some making their first appearance in series vehicle production.

Examples of these include the self-supporting and aerodynamically optimized fairings made completely of CFK, the gear shift assistant, a dashboard like that used in MotoGP, the forged aluminum wheels and the racing brakes with radially bolted calipers.

Wherever the eye of the spectator wanders, it sees pure racing technology that delights every enthusiast. It is unmistakably athletic, a vehicle that inspires on country roads as well as on the racing circuit. Regardless of the limits for the engine output as a result of the principle and the aerodynamic disadvantages from the cylinder configuration of a Boxer, BMW Motorrad deliberately decided to further develop this historic engine concept for a road racer with racing circuit talent.

The key engine data are very respectable: the engine achieves more than 96 kW/128 hp at 8750 min–1 compared with the significantly modified engine of the BMW R 1200 S. The maximum torque lies at 115 Nm at 6000 min–1, the highest revs of the engine reaches a peak value at 9500 min–1. Technically, the BMW HP2 Sport is based on the BMW R 1200 S. Customized to meet the requirements of the ambitious sports rider down to the last detail, the BMW HP2 Sport is however a completely independent and absolutely exceptional motorcycle. Many detailed solutions are based on the experiences gained in long-distance races.

The most striking difference of the BMW HP2 Sport from the endurance racing Boxer is the brand new cylinder heads: Each of the double overhead camshafts (DOHC) uses a drag lever to actuate the valves that are larger than in the BMW R 1200 S. Further modifications such as the flow-optimized intake and outlet, new forged pistons and adapted connecting rod help the engine to achieve the necessary higher output compared to the basic engine. The new stainless steel exhaust system is placed below the engine for the first time. This keeps the construction of the lower area of the motorcycle extremely slim, enabling great freedom of movement for the familiar ‘hanging off’ riding position, and the fitting of a CFK engine spoiler is advantageous to the aero-dynamics.

An inimitable boxer sound with new acoustic quality is generated by the exhaust system and the striking design of the rear silencer is impressive. Another exclusive racing feature is the gearshift assistant together with the narrow ratios of the 6-speed gearbox to enable fast gear changes without having to ease off the gas and operate the clutch. This technology is offered for the first time in a series vehicle. In order to adapt the gearshift pattern for the racing circuit, a suitable replacement pressure sensor is available as special equipment if necessary.

The fully adjustable Öhlins sports chassis also has a Brembo monoblock brake system with radially mounted, four-piston fixed calipers at the front. Optimum ergonomics are ensured by the adjustable forged aluminum footrests, the adjustable stock handlebar and the Magura brake levers with radial mounted brake actuators.

The series dashboard that comes directly from MotoGP sport provides the rider with important information and can also deliver lap times plus other racing relevant data as well as the usual displays.

Attention was paid consistently to the lightweight construction of all components. This includes not only the self-supporting front fairing and the likewise self-supporting carbon rear or the weight-optimised forged wheels, but also hidden details such as the lightweight generator from the racing world. That’s how it was possible to reduce the unladen weight of the HP2 Sport to DIN standard with full tank (90%) to 199 kilos. The dry weight is a mere 178 kilos.

The interplay of variable ergonomic design, increased engine output and the favourable centre of gravity of the Boxer guarantees superb handling and racing potential. Even if racing fascination is clearly at the forefront of the BMW HP2 Sport, it does not have to forgo the safety design feature of ABS. The sophisticated anti-locking system specially adapted to the HP2 Sport is available as an option and is configured so it can be switched off for the racetrack.



From BMW Press