Aprilia RXV/SXV

The RXV/SXV series are four-stroke, v-twin off-road (RXV) or dual sport supermoto (SXV) motorcycles produced by Aprilia since 2006. Both versions have either 449 cc (27.4 cu in) or 549 cc (33.5 cu in) engine sizes.

Aprilia RXV/SXV 4.5-5.5

Manufacturer	Aprilia
Production	2007-2010
Class	Off road enduro (RXV) Dual sport supermoto (SXV)
Engine	RXV/SXV 450: 449 cc twin-cylinder 77° v-twin dry sump water-cooled four-stroke with 12.5:1 compression ratio. RXV/SXV 550: 549 cc twin-cylinder 77° v-twin dry sump water-cooled four-stroke with 12:1 compression ratio.
Power	RXV/SXV 450: 60 bhp claimed crank hp. RXV/SXV 550: 70 bhp claimed crank hp. SXV 450 measured, dynojet: 54.3 djhp at 11000 rpm. SXV 550, measured, dynojet: 68.9 djhp at 10900 rpm.
Torque	NA
Transmission	5-speed manual with separate gearbox lubrication, final chain drive
Suspension	Front: 48 mm upside down fork with two adjustments. Rear: hydraulic monoshock with compression and rebound adjustment.
Brakes	double oversize disc, wave rotors
Tires	120/70 x 17 inches, 180/55 x 17 inches
Wheelbase	1495 mm (58.86 inches)
Dimensions	L: 2222 mm (87.4 inches) W: 800 mm (31.5 inches) H: 1300.5 mm (51.2 inches)
Seat height	918 mm (36.1 inches)
Weight	313 lb (142 kg) (dry) NA (wet)
Fuel capacity	7.8 liters (2.0 gallons) 12 litre (3.0 gallons)

Frame/chassis

The RXV/SXV's frame is made of a combination of tubular steel and aluminum plates. The compact engine fits into the frame in such a way that the air filter sits on top of the engine, below the gas tank, rather than the more traditional under-the-seat location.^[1] This allows for a lower distribution of weight.

Engine

The RXV/SXV has a v-twin engine, and is one of the first off-road motorcycles to feature fuel injection. The 450 has a displacement of 449 cc, while the 550 has a displacement of 549 cc. Each engine has a single-overhead-cam and four valves per cylinder. The 77-degree cylinder angle minimizes vibration.^[1] Both are dry sump, with a separate oil tank for the gearbox and engine.

The 450 produces a claimed 60 horsepower (45 kW) at the crank, while the 550 produces a claimed 70.^[1][2]