Aprilia is proud to present the model year 2008 RXV 4.5 / 5.5, designed on the basis of experience gained in the Enduro World Championship and improved by input from four times world champion Stefan Merriman. The new bike is even more powerful, agile and reliable (service intervals have almost doubled), to satisfy the demands of professionals and amateurs alike. Among the main developments is a new mapping system that lets you switch between two different mappings, with a "full power" setting for use in conditions of good grip, and a "soft" setting for smoother power delivery under more difficult riding conditions. Homologation is now to Euro 3 standard, and dry weight is down by four-kilograms too.

The design of the new Aprilia RXV 4.5 / 5.5 model year 2008 owes much to the concept of constant evolution in the name of competition. Experience gained in the Enduro World Championship, which saw Aprilia Racing at the top of the field, plus valuable hints and suggestions from four times world champion Stefan Merriman, the team’s top rider, have enabled Aprilia’s engineers and designer to transfer advances from racing to production. Impressive team work has led to a number of major improvements over the 2007 bike, making the 2008 RXV even more "race ready", and better equipped to satisfy the demands of professionals and amateurs alike.

Aesthetically, the 2008 RXV looks meaner than ever thanks to new graphics, a two-tone black and red seat, brand new, lightweight racing headlight, and a distinctly aggressive nose. Even the tail light is new. In conjunction with general refinements, these important new details have also led to a significant reduction in dry weight, down by four-kilograms to only 113- kilograms. A great deal of work has also been done to ensure the sort of ergonomics needed for effective competition use. The new fuel tank blends in better with the overall design of the bike, enabling the rider to shift his weight around more easily. The new handlebars have eliminated the cross-bar and feature more practical and race-oriented controls. The latest RXV makes it even easier for man and machine to blend into one, without any annoying interference from structural parts. The suspension (featuring a 45-millimeters upside down fork at the front and a monoshock at the rear) also incorporates new settings suggested by the team official riders, for improved stability on fast sections and better damping over rough ground.

A perimeter frame envelops the revolutionary, powerful, yet reliable four stroke 77-° V-twin engine (with liquid-cooling, single overhead cam with rocker operated exhaust valves, chain cam drive, four titanium valves, and electronic fuel injection). Though now homologated to Euro 3 standard, blistering performance is guaranteed from both engine sizes, 449-cubic-centimeter (RXV 4.5) and 549-cubic-centimeter (RXV 5.5).

The main improvements to the engine on the 2008 bike concern the electronic management system. This now lets you switch between two different mappings by pressing an easy-to-reach button on the handlebars. This extremely useful feature allows you to select &34;full power" for use under conditions of good grip or a "soft" setting for more controllable power over challenging surfaces. This exceptional riding aid has been appreciated by expert riders (the system was first tried out in the world championship), and enthusiasts in general. With it, one click is all you need to have the right power to match changing conditions.

Despite their truly impressive performance, both versions of the engine now boast extended service intervals, among the longest in the category.

The choke is new too, and has been moved from the handlebars to the filter box, which contains a new sponge filter derived from the official racing machines. The 2008 model year RXV also offers a choice of two types of exhaust silencer. The RXV 2008 is fitted as standard with classical and seductive under-seat tail pipes. Exceptionally, however, brand new stainless steel side mounted silencers that can be fitted on racing circuits are also delivered along with the bike. These have been specially developed in conjunction with Arrow to deliver smoother power right across the useful engine speed range.