Aprilia SX 50

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Aprilia SX 50
Manufacturer Aprilia
Parent company Piaggio
Production Since 2006
Class Supermotard
Engine 49.76 cc, 11.5:1 CR, liquid cooled, two stroke
Transmission 6-Speed Manual
Suspension Ø40 mm hydraulic fork with leading axle; wheel travel 195 mm
Rear: Hydraulic monoshock; Non-adjustable; wheel travel 180 mm
Brakes Front: 300 mm stainless steel disc; floating quad-piston caliper
Rear: 180 mm stainless steel disc; twin-piston caliper
Tires Front: 2.50 X 17
Rear: 3.50 x 17
Wheelbase 55.354 in (1,406 mm)
Dimensions L: 79.68 in (2,024 mm)
W: 80.511 in (2,045 mm)
H: 32.677 in (830 mm)
Fuel capacity 7 Litres
Related Aprilia RX50, Aprilia MX50, Aprilia SX125

The Aprilia SX50 is a street motorcycle sold by Aprilia since 2006. It is powered by a D50B0 single-cylinder two-stroke engine with a nikasil-lined cast-iron cylinder manufactured by Derbi.


The engine in the Aprilia SX 50 is sourced from Derbi/Piaggio. This engine was used in the Derbi Senda DRD/X-Race/X-Treme supermotos, as well as the Derbi GPR 50 and Aprilia RS 50 road bikes. Engine parts from the bikes supermotos can be directly swapped with one another, there are some small differences between the road bike and supermoto engine which ceases the transfer of some external engine parts (exhaust, airbox).