The 1959 Triumph Bonneville T120 from United Kingdom was powered by a 649cc OHV twin producing 46hp at 6500rpm. Weighing 172.0kg (379 lbs) and with a seat height of 790mm, it was aimed at standard riders.
The 1952 Harley-Davidson K Model, hailing from United States, by contrast offered 745cc of SV V-twin power, delivering 30hp at 5000rpm. Tipping the scales at 195.0kg (430 lbs) with a top speed of 140km/h (87 mph), it offered a distinct riding experience. 1950s bikes represent the golden age of British motorcycling and early Japanese innovation, with well-maintained examples commanding premium prices.
Specifications Comparison
| 1959 Triumph Bonneville T120 | 1952 Harley-Davidson K Model | |
|---|---|---|
| Displacement | 649 cc | 745 cc |
| Power | 46 hp | 30 hp |
| Torque | 52.0 Nm | 45.0 Nm |
| Cylinders | 2 | 2 |
| Top Speed | 177 km/h | 140 km/h |
| Quarter Mile | — | — |
| Dry Weight | 172.0 kg | 195.0 kg |
| Wet Weight | 185.0 kg | 212.0 kg |
| Seat Height | 790 mm | 710 mm |
| Wheelbase | 1400 mm | 1430 mm |
| Fuel Capacity | 14.0 L | 13.0 L |
| Gears | 4 -speed | 4 -speed |
The Verdict
For pure standard performance, the 1959 Triumph Bonneville T120 has the edge thanks to more power (46hp vs 30hp) and a higher top speed and lower weight. The 1952 Harley-Davidson K Model, however, excels when all-round versatility and everyday riding is the priority. For collectors, the 1959 Triumph Bonneville T120 commands more attention with a 9/10 collectibility rating. Parts availability is good for the 1959 Triumph Bonneville T120 and difficult for the 1952 Harley-Davidson K Model — an important factor for any restoration project.
About the 1959 Triumph Bonneville T120
The 1959 1959 Triumph Bonneville T120 packs a 649cc OHV twin engine with 46hp into a standard motorcycle package from Triumph.
Full 1959 Triumph Bonneville T120 Profile →About the 1952 Harley-Davidson K Model
A standard motorcycle from 1952, the 1952 Harley-Davidson K Model delivers 30hp from its 745cc SV V-twin engine.
Full 1952 Harley-Davidson K Model Profile →