Aprilia RS4 50 Replica (2012-) vs Aprilia RS4 125 (2017-18)
Comparison technical specifications
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| Make: | Aprilia | Aprilia |
| Model: | RS4 50 Replica | RS4 125 |
| Years: | 2012- | 2017-18 |
| Engine: | Two stroke, single cylinder, DOHC, 4-valve | Four stroke, single cylinder, DOHC, 4 valves |
| Capacity: | 49.9 cc / 3.05 cub in. | 124.8 cc / 7.6 cu in |
| Bore x Stroke: | 39.9 x 39.9 mm | 58 X 47 mm |
| Cooling System: | Liquid cooled | Liquid cooled |
| Compression Ratio: | 11.5:1 | 12.5 ± 0.5:1 |
| Lubrication: | Automatix mixer | Wet sump |
| Ignition: | CDI | Electronic with CDI capacity discharge |
| Starting: | Electric | Electric |
| Clutch: | Multiple discs in oil bath | Multiple discs, in oil bath |
| Transmission: | 6-Speed | 6 Speed |
| Final Drive: | Chain | Chain: 60/13 (4.61) |
| Frame: | Aluminium | Aluminum perimeter frame |
| Front Suspension: | Upside down fork, Ø41 mm | Ø41 mm Upside down fork |
| Front Wheel Travel: | 110 mm / 4.3 in. | 110 mm / 4.3 in |
| Rear Suspension: | Asymmetric swingarm, monoshock | Asymmetric swingarm with monoshock |
| Rear Wheel Travel: | 122 mm / 4.8 in. | 130 mm / 5.1 in |
| Front Brakes: | Stainless steel disc, Ø 300 mm, 4-piston radial caliper | Single 300 mm disc, 4 piston caliper |
| Rear Brakes: | Stainless steel disc, Ø 218 mm, single piston caliper | Single 218 mm disc, 1 piston caliper |
| Wheels: | Light alloy with 6 split spokes | light alloy with 6 split spokes, with sealing profile for tubeless tyres. |
| Front Tyre: | 110/80-17 | 110/80 17 |
| Rear Tyre: | 130/70-17 | 130/70 17 |
| Dimensions: | Length: 1953 mm / 76.9 in Width: 740 mm / 29.1 in Height: 1138 mm / 44.8 in | Length: 1953 mm / 76.8 in Width: 760 mm / 29.9 in Height: 1135 mm / 44.6 in |
| Wheelbase: | 1350 mm / 53.1 in | 1353 mm / 53.2 in |
| Seat Height: | 820 mm / 32.3 in. | 820 mm / 32.3 in |
| Fuel Capacity: | 14.5 Litres / 3.8 US gal | 14.5 Litres / 3.8 US gal |