Sport · 1957
International Model 30
MotoLibrary Score
52 /100 Balanced
Top Speed
150 km/h
Engine
490 ccm
Technical Overview
1957 Norton International Model 30 Technical Analysis & Specification Breakdown
Built around Norton's sport motorcycle platform, the 1957 Norton International Model 30 utilizes a 490 cc (29.9 cu in) air-cooled single cylinder, four-stroke layout. Internal engine geometry specifies a bore and stroke of 79.0 x 100.0 mm (3.1 x 3.9 inches) with a 7.2:1 compression ratio.
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.
Engine
Displacement 490.0 ccm (29.90 cubic inches)
Engine Type Single cylinder, four-stroke
Engine Details Single cylinder, four-stroke
Compression 7.2:1
Bore x Stroke 79.0 x 100.0 mm (3.1 x 3.9 inches)
Fuel System Carburettor. Amal
Fuel Control Overhead Cams (OHC)
Cooling Air
Transmission
Final Drive Chain (final drive)
Performance
Top Speed 150.0 km/h (93.2 mph)
Chassis
Wheelbase 1391 mm (54.8 inches)
Wheels & Brakes
Wheels Spoked
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