1957 James Colonel 225 Technical Analysis & Specification Breakdown
Positioned in James's allround motorcycle lineup, the 1957 James Colonel 225 features a 225 cc (13.7 cu in) air-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 9.6 HP (7 kW) at 4,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 42.7 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 Colonel 225 measures 125 kg (276 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (13.02 kg per horsepower).
Within MotoLibrary's James archive, this model family spans 5 indexed model years from 1955 to 1959, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
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.
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.
