The Triumph TR 6 Thunderbird motorcycle specifications include a 648 cc (39.54 cu in) engine, power of 42 hp (30.7 kW) @ 6,500 rpm, a 5-speed gearbox, and a listed weight of 190 kg (418.9 lb).
Key specifications
Year-specific specification changes
How the Triumph TR 6 Thunderbird compares
This compares the motorcycle with all Triumph models in this specifications database. The blue marker is this model and the grey line is the Triumph database average.
About 52% lower than the Triumph database average. Around the 11th percentile across Triumph models.
About 32% lower than the Triumph database average. Around the 14th percentile across Triumph models.
About 20% lighter than the Triumph database average. Around the 15th percentile across Triumph models.
Very close to the Triumph database average. Around the 59th percentile across Triumph models.
Triumph database percentile rankings
Percentiles show where this motorcycle sits across the Triumph specifications database. They are descriptive database rankings, not performance ratings.
42 hp — more powerful than about 11% of Triumph models with power data.
648 cc — larger displacement than about 14% of Triumph models.
190 kg — heavier than about 15% of Triumph models, or lighter than about 85%.
18.5 L — larger than about 59% of Triumph fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 3.25-19 |
|---|---|
| Rear tire size | 4.00-18 |
| Power-to-weight ratio | 0.221 hp/kg |
| Power-to-weight | 221.1 hp/tonne |
| Specific power | 64.8 hp/L |
| Bore/stroke ratio | 1.06:1 (Oversquare) |
Model information
| Category | Classic |
|---|
Engine specifications
| Engine type | Twin, four-stroke |
|---|---|
| Displacement | 648 cc (39.54 cu in) |
| Power | 42 hp (30.7 kW) @ 6,500 rpm |
| Bore × stroke | 76.0 x 71.5 mm (3.0 x 2.8 inches) |
| Compression ratio | 9.0:1 |
| Valves per cylinder | 2 |
| Cooling system | Air |
| Fuel control | Overhead Valves (OHV) |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Expanding brake |
| Front tire | 3.25-19 |
| Rear tire | 4.00-18 |
Dimensions and weight
| Wet weight | 190 kg (418.9 lb) |
|---|
Fuel and emissions
| Fuel capacity | 18.50 L (4.89 US gal) |
|---|
Performance
| Top speed | 160.0 km/h (99.4 mph) |
|---|
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Triumph models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Triumph information before relying on them. Visit the official Triumph website.