Aprilia 125 Classic (1998-00) vs Aprilia Pegaso 650 (1999-00) vs Aprilia Atlantic 200 (2008-10) vs Aprilia RS4 50 Replica (2014) vs Indian Chieftain Dark Horse (2018-19)
Comparison technical specifications
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| Make: | Aprilia | Aprilia | Aprilia | Aprilia | Indian |
| Model: | 125 Classic | Pegaso 650 | Atlantic 200 | RS4 50 Replica | Chieftain Dark Horse |
| Years: | 1998-00 | 1999-00 | 2008-10 | 2014 | 2018-19 |
| Engine: | Single cylinder, two-stroke | Four stroke, single-cylinder, DOHC, 5 valves | Four stroke, single cylinder, SOHC, 4 valves per cylinder | Two stroke, single cylinder | Four stroke, V-twin, Thunder Stroke™ 111 |
| Capacity: | 124.8 cc / 7.5 cu in | 652 cc / 39.8 cu in | 199 cc / 12.1 cu in | 49.9 cc / 3.05 cub in. | 1818 cc / 111 cu in |
| Bore x Stroke: | 54 x 54.5 mm | 100 x 83 mm | 72 x 48.6 mm | 39.9 x 39.9 mm | 101x 113 mm |
| Compression Ratio: | 12.5:1 | 9.1:1 | 11.5:1 | 11.5:1 | 9.5:1 |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled | Liquid cooled | Air cooled |
| Starting: | Electric | Electric | Electric | Electric | Electric |
| Transmission: | 6 Speed | 5 Speed | Automatic | 6-Speed | 6 Speed |
| Final Drive: | Chain | Chain | Belt | Chain | 2.2 : 1 |
| Front Suspension: | Telescopic fork | Ø45 mm Upside down forks preload adjustable, Marzocci | Hydraulic forks, Ø 35 mm | Upside down fork, Ø41 mm | Telescopic forks |
| Front Wheel Travel: | 120 mm / 4.7 in | 175 mm / 6.9 in | 105 mm / 4.1 in | 110 mm / 4.3 in. | 120 mm / 4.7 in |
| Rear Suspension: | 2 x Hydraulic shock absorbers | Varying section high strength steel swing-arm, Aprilia Progressive System (APS) rising rate linkage | Single hydraulic shock, adjustable preload | Asymmetric swingarm, monoshock | Single shock |
| Front Brakes: | Single Ø230 mm disc, 2 piston caliper | Single Ø300 mm disc, 2 piston caliper | Single Ø 240 mm disc, with hydraulic transmission | Stainless steel disc, Ø 300 mm, 4-piston radial caliper | 2x Floating Rotor 4 piston calipers |
| Rear Brakes: | Drum, Ø160 mm | Single Ø220 mm disc, 1 piston caliper | Single Ø 190mm disc, with hydraulic transmission, combined with front | Stainless steel disc, Ø 218 mm, single piston caliper | Single Floating Rotor 2 piston calipers |
| Front Tyre: | 90/90-19 | 100/90-19 | 110/90 -13 | 110/80-17 | Dunlop® American Elite 130/60B19 61H |
| Rear Tyre: | 130/90-16 | 130/80-17 | 130/70 -13 | 130/70-17 | Dunlop® Elite 3 Multi-Compound 180/60R16 80H |
| Fuel Capacity: | 10 Litres / 2.6 US gal | 21 Litres / 5.5 US gal | 10.5 Litres / 2.8 US gal | 14.5 Litres / 3.8 US gal | 20.8 Litres / 5.5 gal |