| Attribute | Aprilia RS4 50 2015 × | Aprilia RS 125 Replica SBK × |
|---|---|---|
| General | ||
| Production from (year) | 2015 | 2010 |
| Make | Aprilia | Aprilia |
| Model | Aprilia RS4 50 | Aprilia RS 125 Replica SBK |
| Category | Sport | Sport |
| Engine and transmission | ||
| Engine type | Single cylinder, two-stroke | Single cylinder, two-stroke |
| Fuel system | Carburettor | Carburettor. Dell Orto VHST 28. |
| Displacement (cm³) | 49.9 | 124.8 |
| Cooling system | Liquid | - |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 39.9 | 54 |
| Stroke (mm) | 39.9 | 54.5 |
| Gearbox | 6-speed | 6-speed |
| Emission details | Euro 2 | - |
| Driveline | Chain, 11/53. Primary drive: Gears, 21/78. | - |
| Ignition | Electronic with CDI capacity discharge | Electronic CDI ignition. |
| Clutch | Multiplate wet clutch | Multi-plate in oil bath. |
| Lubrication system | Automatic mixer | Separate mixing with variable displacement, volumetric pump. |
| Compression | 11.5:1 | 12.5:1 |
| Chassis | ||
| Front suspension | 41 mm upside down fork, wheel travel 110 mm | Upside down hydraulic fork, Ø 40 mm. Wheel travel 120 mm. |
| Rear suspension | Asymmetric swingarm with monoshock, wheel travel 130 mm | Swingarm with asymmetric members in thin wall box section cast aluminium. Hydraulic monoshock with adjustable spring preload. Wheel travel 120 mm. |
| Front brakes | Single disc. Radial 4 piston calliper | Single disc |
| Rear brakes | Single disc | Single disc |
| Diameter (mm) | 220 | 220 |
| Front tyre | 100/80-17 | 110/70-17 |
| Rear tyre | 130/70-17 | 150/60-17 |
| Other | ||
| Starter | Electric | Electric |
| Color options |
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|
| Instruments | Analogue rev counter and LCD ccreen | - |
| Dimensions | ||
| Wheelbase (mm) | 1,350 | 1,345 |
| Overall height (mm) | 1,138 | 1,100 |
| Overall length (mm) | 1,953 | 1,955 |
| Overall width (mm) | 740 | 720 |
| Seat height (mm) | 820 | 805 |
| Performance | ||
| Reserve fuel capacity (l) | 3.3 | - |
| Fuel capacity (l) | 14.5 | 14 |