Triumph Speed Twin 500 (1938-46) vs Aprilia AF1 Prototipo (1985)
Comparison technical specifications
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| Make: | Triumph | Aprilia |
| Model: | Speed Twin 500 | AF1 Prototipo |
| Years: | 1938-46 | 1985 |
| Engine: | Four stroke, parallel twin, OHV | Two stroke, single cylinder |
| Capacity: | 498 cc / 30.4 cub in. | 123 cc / 7.5 cu in |
| Bore x Stroke: | 63 x 80 mm | 54 x 54.5mm |
| Compression Ratio: | 7.1:1 | 15.5:1 |
| Cooling System: | Air cooled | Liquid cooled |
| Induction: | Single Amal carburetor | Dell'Orto carburetor, Ø 28 mm |
| Max Power: | 20.9 kW / 28 hp @ 6000 rpm | 18.7 kW / 25.1 hp @10000 rpm |
| Transmission: | 4 Speed | 6 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Rigid fork with leaf spring | Telescopic fork, 4-way anti-drive adjustable |
| Rear Suspension: | Rigid, spring loaded saddle | Sebac mono shock |
| Front Brakes: | Drum | Single Ø 260 mm disc |
| Rear Brakes: | Drum | Single Ø 240mm disc |
| Front Tyre: | 3.25 - 19 | 100/80-16 |
| Rear Tyre: | 3.50 - 19 | 120/80-16 |
| Dry Weight: | 182 kg / 401 lbs | 120 kg / 265 lbs |
| Fuel Capacity: | 18 L / 4.8 US gal / 4.0 Imp gal | 22.5 Litres / 5.9 US gal |