The 1957 Harley-Davidson Sportster XL from United States was powered by a 883cc OHV V-twin Ironhead producing 40hp at 5500rpm. Weighing 200.0kg (441 lbs) and with a seat height of 740mm, it was aimed at standard riders.
The 1970 Harley-Davidson XR750 by contrast offered 748cc of OHV V-twin power, delivering 90hp at 8000rpm. Tipping the scales at 145.0kg (320 lbs) with a top speed of 210km/h (130 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
| 1957 Harley-Davidson Sportster XL | 1970 Harley-Davidson XR750 | |
|---|---|---|
| Displacement | 883 cc | 748 cc |
| Power | 40 hp | 90 hp |
| Torque | 56.0 Nm | 72.0 Nm |
| Cylinders | 2 | 2 |
| Top Speed | 160 km/h | 210 km/h |
| Quarter Mile | — | — |
| Dry Weight | 200.0 kg | 145.0 kg |
| Wet Weight | 220.0 kg | 158.0 kg |
| Seat Height | 740 mm | 700 mm |
| Wheelbase | 1460 mm | 1380 mm |
| Fuel Capacity | 13.0 L | 10.0 L |
| Gears | 4 -speed | 4 -speed |
The Verdict
Comparing these two Harley-Davidson machines reveals the brand's evolution. The 1957 Harley-Davidson Sportster XL laid the groundwork with 40hp, while the later 1970 Harley-Davidson XR750 pushed output to 90hp. Both share equal collector appeal at 9/10. Either way, both are worthy additions to any Harley-Davidson collection. Parts availability is good for the 1957 Harley-Davidson Sportster XL and very difficult for the 1970 Harley-Davidson XR750 — an important factor for any restoration project.
About the 1957 Harley-Davidson Sportster XL
Introduced in 1957, the 1957 Harley-Davidson Sportster XL features a 883cc OHV V-twin Ironhead engine producing 40hp, establishing itself as a notable standard motorcycle.
Full 1957 Harley-Davidson Sportster XL Profile →About the 1970 Harley-Davidson XR750
Born in 1970, the 1970 Harley-Davidson XR750 is a 748cc twin-cylinder racing machine producing 90hp from Harley-Davidson.
Full 1970 Harley-Davidson XR750 Profile →