Engineered by Harley-Davidson for the sport motorcycle segment, the 1957 Harley-Davidson Sportster XL Ironhead relies on a 883 cc (53.9 cu in) air-cooled v2, four-stroke powerplant. In factory specification, peak output is rated at 40 HP (29.2 kW) at 5,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 45.3 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the Sportster XL Ironhead measures 224.5 kg (495 lbs) dry, translating to a power-to-weight ratio of 0.18 HP/kg (5.61 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,448 mm (57 in) wheelbase engineered for balanced agility and highway composure. The 16.6-liter (4.4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 153 km/h (95 mph).
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
