The Triumph T 120 R Bonneville 650 motorcycle specifications include a 649 cc (39.60 cu in) engine, power of 49 hp (35.8 kW) @ 7,200 rpm, a 4-speed gearbox, and a listed weight of 192 kg (423.3 lb).
Key specifications
The 1970 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Triumph T 120 R Bonneville 650 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 44% lower than the Triumph database average. Around the 19th percentile across Triumph models.
About 32% lower than the Triumph database average. Around the 18th percentile across Triumph models.
About 19% lighter than the Triumph database average. Around the 19th percentile across Triumph models.
Very close to the Triumph database average. Around the 54th percentile across Triumph models.
Very close to the Triumph database average. Around the 56th 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.
49 hp — more powerful than about 19% of Triumph models with power data.
649 cc — larger displacement than about 18% of Triumph models.
192 kg — heavier than about 19% of Triumph models, or lighter than about 81%.
800 mm — taller than about 54% of Triumph models.
18 L — larger than about 56% of Triumph fuel tanks in this database.
Dimensions compared with Triumph average
Each measurement is compared with the average value across Triumph models where that dimension is available.
2,134
2,218
4% below average.
813
821
Close to average.
1,016
1,199
15% below average.
1,416
1,491
5% below average.
800
789
Close to average.
Mechanical overview
Additional useful specifications
| Front tire size | 3.25-19 |
|---|---|
| Rear tire size | 4.00-18 |
| Power-to-weight ratio | 0.255 hp/kg |
| Power-to-weight | 255.2 hp/tonne |
| Specific power | 75.5 hp/L |
| Bore/stroke ratio | 0.87:1 (Undersquare) |
Engine specifications
| Engine type | Twin, four-stroke |
|---|---|
| Displacement | 649 cc (39.60 cu in) |
| Power | 49 hp (35.8 kW) @ 7,200 rpm |
| Torque | 50.2 Nm (5.1 kgf-m or 37.0 ft.lbs) |
| Bore × stroke | 71.0 x 82 mm (2.8 x 3.2 inches) |
| Compression ratio | 9.0:1 |
| Valves per cylinder | 2 |
| Cooling system | Air |
| Fuel system | Carburettor. Twin Amal Monobloc 930 |
| Fuel control | Overhead Valves (OHV) |
| Ignition | Coil with contact breaker points |
| Starter | Electric |
Transmission and drivetrain
| Gearbox | 4-speed |
|---|---|
| Final drive | Chain (final drive) |
| Clutch | Wet, multi-plate |
Chassis and suspension
| Frame | Steel, single-downtube |
|---|---|
| Front suspension | Telescopic forks |
| Rear suspension | Twin shock absorbers |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake) |
|---|---|
| Rear brakes | Expanding brake |
| Front tire | 3.25-19 |
| Rear tire | 4.00-18 |
Dimensions and weight
| Wet weight | 192 kg (423.3 lb) |
|---|---|
| Seat height | 800 mm (31.5 inches) |
| Overall length | 2,134 mm (84.0 inches) |
| Overall width | 813 mm (32.0 inches) |
| Overall height | 1,016 mm (40.0 inches) |
| Wheelbase | 1,416 mm (55.8 inches) |
Fuel and emissions
| Fuel capacity | 18.00 L (4.76 US gal) |
|---|
Performance
| Top speed | 176.0 km/h (109.4 mph) |
|---|
Electrical and instruments
| Electrical | 12V battery. |
|---|
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.