Aprilia RS 125 (1999-02) vs Vespa Primavera 125 (2015-) vs Ariel VH 500 Red Hunter (1932-59)
Comparison technical specifications
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| Make: | Aprilia | Vespa | Ariel |
| Model: | RS 125 | Primavera 125 | VH 500 Red Hunter |
| Years: | 1999-02 | 2015- | 1932-59 |
| Engine: | Single cylinder, two stroke, reed valves induction | Four stroke, single cylinder, SOHC, 3 valve | Four stroke, stroke, single cylinder, OHV, 2-valves |
| Capacity: | 125 cc / 7.6 cu in | 124.5 cc / 7.6 cub in | 497 cc / 30.3 cu in |
| Bore x Stroke: | 54 x 54.5mm | 52 x 58.6 mm mm | 86.4 x 85 mm (after 1936: 81.8 x 95) |
| Compression Ratio: | 14.5:1 | 10.5:1 | 6.0:1 (after 1954: 6.8:1) |
| Cooling System: | Liquid cooled | Air cooled, forced | Air cooled |
| Ignition: | Electronic | Electronic | Magnet/flywheel |
| Starting: | Electric | Electric | Kick start |
| Max Power: | 24.8 kW / 34 hp @ 11000 rpm | 7.8 kW / 10.6 hp @ 7700 rpm | 17.9 kW / 24 hp @ 6000 rpm |
| Transmission: | 6 Speed | CVT | 4-Speed |
| Final Drive: | Chain | Belt | Chain |
| Front Suspension: | Upside-down forks, Ø 40mm | Single arm with coil spring and dual action mono shock absorber | Grider front forks |
| Rear Suspension: | Monoshock | Hydraulic monoshock | Rigid, springloaded saddle (after 1954: dual shocks) |
| Front Brakes: | Single 320 mm discs, 4 piston caliper | Single Stainless steel 200mm disc, hydraulically operated | Drum |
| Rear Brakes: | Single 240 mm disc, 2 piston caliper | Drum, 140 mm, mechanically operated | Drum |
| Dry Weight: | 115 kg / 254 lbs | 115 kg / 254 lbs | 190 kg / 418 lbs |
| Fuel Capacity: | 11.5 L / 3.0 US gal | 8 Litres / 2.1 US gal | 14.8 L / 3.9 US gal |
| Top Speed: | 171.3 km/h / 106 mph | 64 km/h / 40 mph | 140 km/h / 87 mph |