Across 7 covered model years from 1963 to 1969, the Triumph Bonneville T120R Roadster motorcycle has a listed dry weight of 363.8 lb (165 kg).
Triumph Bonneville T120R Roadster weight overview
This is neither unusually light nor extremely heavy. For most riders the practical weight question is more about seat height, center of mass and low-speed balance than the scale number alone. The comparison uses dry weight because a usable wet/running figure was not supplied, so the actual ready-to-ride motorcycle will be heavier.
Middleweight Motorcycle
How heavy is the Triumph Bonneville T120R Roadster?
dry weight
Using a model-level dry weight comparison, the Triumph Bonneville T120R Roadster is lighter than about 71.1% of 19 Triumph sport bikes with compatible weight data.
Dry weight
Bike + rider total weight
These totals use the model’s representative dry weight. They exclude riding gear, luggage and a passenger.
Triumph Bonneville T120R Roadster weight & related specs
| Model years covered | 1963, 1964, 1965, 1966, 1967, 1968, 1969 |
|---|---|
| Dry weight | 363.8 lb (165 kg) |
| Engine displacement | 649 cc |
| Power | 46 hp |
| Fuel capacity | 2.5 US gal (9.46 L) to 4 US gal (15.14 L) |
| Full-tank fuel weight (estimated) | 15.5 lb (7 kg) to 24.9 lb (11.3 kg) |
Weight changes by model year
The 1963 model is used as the baseline where data is available. Only later supplied values that differ are shown below. A year pill does not mean every individual weight field was supplied for that year.
Useful weight calculations
| Horsepower per 100 lb | 12.65 hp / 100 lb |
|---|---|
| Pounds per horsepower | 7.91 lb / hp |
| Displacement per pound | 1.78 cc / lb |
| Weight per 100 cc | 56 lb / 100 cc |
| Fuel weight as % of bike weight | 4.3% to 6.8% |
| Weight with full tank | 379.3 lb (172 kg) to 388.6 lb (176.3 kg) |
What the weight numbers tell you
Triumph Bonneville T120R Roadster weight FAQ
How heavy is the Triumph Bonneville T120R Roadster?
Listed dry weight is 363.8 lb (165 kg). Because no usable wet/running figure was supplied, treat that as a lower starting point rather than the exact on-road weight.
Is the Triumph Bonneville T120R Roadster heavy compared with other Triumph sport bikes?
It is on the lighter side in this dataset. Its representative dry weight sits around the 29th weight percentile among 19 Triumph sport bikes, meaning most compatible models are heavier.
Does the Triumph Bonneville T120R Roadster weight change by model year?
Not in the usable weight data on this page. Across the covered 1963-1969 years, the supplied weight figure remains the same where comparable values are available.
How much does the Triumph Bonneville T120R Roadster fuel weigh?
The listed tank capacity is 2.5 US gal (9.46 L) to 4 US gal (15.14 L). Using approximately 0.745 kg/L gasoline, a full tank is roughly 15.5 lb (7 kg) to 24.9 lb (11.3 kg). That is an estimate for fuel mass, not an official Triumph curb-weight calculation.
How heavy is the Triumph Bonneville T120R Roadster with an average-size rider?
A 180 lb rider brings the simple bike-plus-rider total to roughly 543.8 lb (246.6 kg) using the representative dry figure. Gear and luggage would add more.
How much horsepower does the Triumph Bonneville T120R Roadster have per 100 lb?
Where compatible power and weight figures are available, it works out to 12.65 hp per 100 lb. That places it around the 15th percentile within the compatible Triumph sport power-to-weight comparison.
Can I treat the Triumph Bonneville T120R Roadster dry weight as curb weight?
No. The usable figure is dry weight, so it excludes at least some operating fluids. Dry weight plus the estimated full fuel load is about 379.3 lb (172 kg) to 388.6 lb (176.3 kg), and oil/coolant or definition differences may add more.
What does the Triumph Bonneville T120R Roadster weigh with a full tank?
Filling the listed tank brings the calculated bike weight to roughly 379.3 lb (172 kg) to 388.6 lb (176.3 kg). This estimate is most useful when no official wet/running figure is available.
How much of the Triumph Bonneville T120R Roadster total weight comes from fuel?
Based on the available weight basis, a full tank of gasoline represents about 4.3% to 6.8% of the motorcycle’s weight.
Motorcycle specifications can vary by model year, market, equipment and the exact dry/curb-weight definition. Calculated fuel-weight and ratio figures on this page are estimates derived from the supplied specifications. Confirm critical figures in the owner’s manual or on the official Triumph Motorcycles website.