2005 Aprilia RX 50 Racing Technical Analysis & Specification Breakdown
Positioned in Aprilia's enduro - offroad motorcycle lineup, the 2005 Aprilia RX 50 Racing pairs a 49.7 cc (3 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 8 HP (5.8 kW) at 10,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. Internal engine geometry specifies a bore and stroke of 40.3 x 39.0 mm (1.6 x 1.5 inches).
On the scales, the RX 50 Racing measures 107 kg (236 lbs) wet (curb), translating to a power-to-weight ratio of 0.07 HP/kg (13.38 kg per horsepower). Rider ergonomics and chassis geometry center around a 940 mm (37 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,400 mm (55.1 in) wheelbase engineered for quick, flickable steering geometry. The 9.5-liter (2.5 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 70 km/h (43 mph).
Within MotoLibrary's Aprilia archive, this model family spans 3 indexed model years from 2004 to 2006, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Power-to-Weight
0.07 HP/kg (13.38 kg/HP)
Standover Height
940 mm (37 in)
Engine
Displacement49.7 ccm (3.03 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power8.0 HP (5.8 kW)) @ 10000 RPM
Bore x Stroke40.3 x 39.0 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor. Dell´Orto SHA 14/12 with mixture heating system in manifold
IgnitionElectronic, capacitor discharge
LubricationSeparate mixing with variable displacement pump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMultiple disk in oil bath
Performance
Top Speed70.0 km/h (43.5 mph)
Chassis
Frame TypeClosed cradle split at exhaust level, in high strength steel tubes
Front SuspensionUpside down telescopic fork, Ø 35 mm inners.
Front Travel250 mm (9.8 inches)
Rear SuspensionSwing-arm in box section , with anti-friction bushings, adjustable monoshock with Aprilia Progressive System action
Rear Travel260 mm (10.2 inches)
Wheelbase1400 mm (55.1 inches)
Wheels & Brakes
Front Tyre90/90-21
Rear Tyre110/80-18
Front BrakesSingle disc
Front Brake Ø230 mm (9.1 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight98.0 kg (216.1 pounds)
Weight incl.107.0 kg (235.9 pounds)
Power/Weight0.0816 HP/kg
Seat Height940 mm (37.0 inches) If adjustable, lowest setting.
Overall Length2060 mm (81.1 inches)
Fuel Capacity9.50 litres (2.51 US gallons)
Other
StarterKick
Color OptionsAprilia black/lemon yellow, baltic blue/sky blue, matt black/hot red
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
