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 1956 Harley-Davidson KH, hailing from United States, by contrast offered 883cc of SV V-twin power, delivering 38hp at 5500rpm. Tipping the scales at 200.0kg (441 lbs) with a top speed of 155km/h (96 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 | 1956 Harley-Davidson KH | |
|---|---|---|
| Displacement | 649 cc | 883 cc |
| Power | 46 hp | 38 hp |
| Torque | 52.0 Nm | 52.0 Nm |
| Cylinders | 2 | 2 |
| Top Speed | 177 km/h | 155 km/h |
| Quarter Mile | — | — |
| Dry Weight | 172.0 kg | 200.0 kg |
| Wet Weight | 185.0 kg | 218.0 kg |
| Seat Height | 790 mm | 720 mm |
| Wheelbase | 1400 mm | 1450 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 38hp) and a higher top speed and lower weight. The 1956 Harley-Davidson KH, 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 1956 Harley-Davidson KH — 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 1956 Harley-Davidson KH
Harley-Davidson released the 1956 Harley-Davidson KH in 1956 with a 883cc SV V-twin powerplant making 38hp — a definitive standard motorcycle.
Full 1956 Harley-Davidson KH Profile →