Triumph TR65 Thunderbird (1982-83) vs Yamaha RD 200 (1979) vs Yamaha YX 600 Radian (1988-90) vs Aprilia 125 Pegaso (1993-94)
Comparison technical specifications
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| Make: | Triumph | Yamaha | Yamaha | Aprilia |
| Model: | TR65 Thunderbird | RD 200 | YX 600 Radian | 125 Pegaso |
| Years: | 1982-83 | 1979 | 1988-90 | 1993-94 |
| Engine: | Four stroke, parallel twin cylinder, OHV | Two stroke, torque induction, parallel twin | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. | Two stroke, single cylinder, reed valves |
| Capacity: | 649 cc / 39.6 cu in | 195 cc / 11.8 cu-in | 599 cc / 36.5 cu-in | 124 cc / 7.6 cu in |
| Bore x Stroke: | 76 x 71.5 mm | 52 х 46 mm | 58.5 x 55.7 mm | 54 x 54.5mm |
| Compression Ratio: | 8.6:1 | 7.1:1 | 10.0:1 | 14.0:1 |
| Cooling System: | Air cooled | Air cooled | Air cooled | Liquid cooled |
| Induction: | Single 30 mm Amal carburetor | 2x Y20P Carburetors | 4X BS30 Mikuni Carburetor type | Ø34 mm Dell'Orto carburetor |
| Starting: | Kick | Electric & Kick | Electric | Electric |
| Max Power: | 31.3 kW / 42 hp @ 6500 rpm | 20 hp / 14.7 kW @ 8000 rpm | 66 hp / 49.2 kW @ 9500 rpm | 23 kW / 31 hp @ 10000 rpm |
| Max Torque: | 50.1 Nm / 5.1 kgf-m / 37 ft-lb @ 5500 rpm | 1.9 kgf-m / 8.6 Nm @ 7000 rpm | 51.9 Nm / 38,3 ft.-lbs @ 7500 rpm | 22.5 Nm / 2.3 kgf-m / 16.6 ft-lb @ 85000 rpm |
| Transmission: | 5 Speed | 5 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic fork | Telescopic forks | Telescopic forks, Coil spring, oil damper | Ø41 mm Inverted telescopic forks |
| Rear Suspension: | Dual Girling shocks, 5-way preload adjustment | Dual shocks | Swing arm, dual shock Coil spring, oil damper | Single chock preload adjustable |
| Front Brakes: | Single 250 mm disc | Single 245 mm disc | 2x 266mm discs 2 piston caliper | Single Ø300 mm disc, 2 piston caliper |
| Rear Brakes: | 178 mm Drum | Drum | Drum | Single Ø220 mm disc, 1 piston caliper |
| Front Tyre: | 3.25-19 | 2.75-18-4PR | 110/90-16-59H | 100/90-18 |
| Rear Tyre: | 4.00-18 | 3.25-18-4PR | 130/90-16 67H | 120/80-17 |
| Fuel Capacity: | 18.2 L / 4.8 US gal / 4.0 Imp gal | 11.5 Litres / 3.0 US gal | 12. Litres / 3.2 US gal | 14 Litres / 3.7 US gal |