The bike entered the championship in 1991 as the RSV 250, a factory prototype fielded by Aprilia's works squad. Between 1991 and 2007, the machine existed in two primary configurations: the original RSV 250 and a revised factory version designated the RSW 250. The RSW designation identified the specification used by works teams and contracted riders. A semi-works derivative, the RSW 250 LE, was made available to satellite and semi-factory outfits, while outright privateers raced the production-spec RSV 250 kit racer.
Braking systems evolved across the bike's lifespan. In the early years the front braking configuration was available with either 273 mm carbon discs or 300 mm carbon-steel units. From 1994 onwards the factory settled on dual carbon discs exclusively, in either 255 mm or 273 mm specification. The rear brake began as a 184 mm carbon-steel single disc and was upgraded to 190 mm from 1996.
A substantially revised version designated the RSA 250 was introduced in 2007. Changes included a redesigned intake system, a new disposition for the gear unit and thermal groups, and a longer swingarm that improved both acceleration and traction. Three accelerometers were added to the electronics package to gather more detailed data on power management under low-grip conditions. This data also fed development work on the Aprilia RSV 4 Superbike, which entered the Superbike World Championship in 2009.
The revised engine delivered a broader powerband, operating effectively across a range from 6,000 rpm to 13,500 rpm for maximum output — a meaningful expansion compared to the narrower delivery characteristics of the earlier RSW specification.
Because Aprilia, Gilera, and Derbi all belong to the Piaggio group, the RSA 250 (and the evolved RSW specification that preceded it) was raced under all three brand identities. Gilera and Derbi-badged versions of the machine were effectively rebadged Aprilias, sharing the same technical specification. One of the ten World Championships attributed to the lineage was won under the Gilera name. This cross-brand deployment made the RSW/RSA platform the dominant technical force in 250 cc racing during the 2000s.
The RSW 250 and its variants accumulated ten World Championship titles in the 250 cc class, making it one of the most decorated factory racers of its category. The machine was at the heart of Aprilia's dominance during a period when the Italian manufacturer established itself as the definitive force in 250 cc Grand Prix motorcycle racing.
The Aprilia RSW 250 lineage defined an era in Grand Prix motorcycle racing. Its combination of engineering development pace, championship success across three marque identities within the Piaggio group, and the breadth of its rider roster — encompassing champions ranging from Valentino Rossi to Dani Pedrosa — gave the platform unmatched stature in 250 cc history. When the 250 cc class was replaced by the four-stroke Moto2 category from 2010, the RSA 250 closed a chapter that had produced more titles than any comparable machine in the class.
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