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MotoLibrary Score
45/100Balanced
Power/Weight
0.17 hp/kg
Top Speed
150 km/h
Engine
490 ccm
Technical Overview
1956 Norton International 30 Technical Analysis & Specification Breakdown
Engineered by Norton for the classic motorcycle segment, the 1956 Norton International 30 relies on a 490 cc (29.9 cu in) air-cooled single cylinder, four-stroke powerplant. 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 a 4-speed gearbox and 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.
On the scales, the International 30 measures 173 kg (381 lbs) wet (curb), translating to a power-to-weight ratio of 0.17 HP/kg (5.86 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,391 mm (54.8 in) wheelbase engineered for quick, flickable steering geometry. The 14.19-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 150 km/h (93 mph).
Specific Output
60.2 HP/L
Power-to-Weight
0.17 HP/kg (5.86 kg/HP)
Engine
Displacement490.0 ccm (29.90 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsAlloy motor
Power29.5 HP (21.5 kW)) @ 5500 RPM
Compression7.0:1
Bore x Stroke79.0 x 100.0 mm (3.1 x 3.9 inches)
Valves/Cylinder2
Fuel SystemCarburettor. Amal
Fuel ControlOverhead Cams (OHC)
Ignitionmagneto
LubricationDry sump
CoolingAir
Transmission
Gearbox4-speed
Final DriveChain (final drive)
ClutchMultiplate
Performance
Top Speed149.7 km/h (93.0 mph)
ExhaustChrome pipe with peardrop muffler
Chassis
Frame TypeFeatherbed wideline
Front SuspensionForks
Rear SuspensionSwinging arm with armstrong shocks
Wheelbase1391 mm (54.8 inches)
Wheels & Brakes
Front Tyre3.00-19
Rear Tyre4.00-18
Front BrakesExpanding brake (drum brake). Cable
Front Brake Ø203 mm (8.0 inches)
Rear BrakesExpanding brake (drum brake). Rod operated
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.
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.
