International Model 30

1955 Norton International Model 30 Technical Analysis & Specification Breakdown

At the heart of the 1955 Norton International Model 30 sport motorcycle, Norton utilizes a 490 cc (29.9 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 29.5 HP (21.5 kW) at 5,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 60.2 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

Rider ergonomics and chassis geometry center around a 1,391 mm (54.8 in) wheelbase engineered for quick, flickable steering geometry.

Within MotoLibrary's Norton archive, this model family spans 12 indexed model years from 1947 to 1958, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.