Engineered by Norton for the sport touring motorcycle segment, the 1974 Norton Commando 850 Interstate features a 828 cc (50.5 cu in) air-cooled twin, four-stroke configuration. In factory specification, peak output is rated at 51 HP (37.2 kW) at 6,250 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 61.6 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 Commando 850 Interstate measures 220 kg (485 lbs) wet (curb), translating to a power-to-weight ratio of 0.23 HP/kg (4.31 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance. The 11-liter (2.9 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 191 km/h (119 mph).
Within MotoLibrary's Norton archive, this model family spans 3 indexed model years from 1973 to 1975, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
61.6 HP/L
Power-to-Weight
0.23 HP/kg (4.31 kg/HP)
Standover Height
780 mm (30.7 in)
Engine
Displacement828.0 ccm (50.52 cubic inches)
Engine TypeTwin, four-stroke
Engine DetailsTwin, four-stroke
Power51.0 HP (37.2 kW)) @ 6250 RPM
Compression8.5:1
Bore x Stroke77.0 x 89.0 mm (3.0 x 3.5 inches)
Valves/Cylinder2
Fuel SystemCarburettor. 2 x 30mm Amal concentric
Fuel ControlOverhead Valves (OHV)
Ignition12V, alternator
CoolingAir
Transmission
Gearbox4-speed
Final DriveChain (final drive)
Performance
Top Speed191.0 km/h (118.7 mph)
Chassis
Front SuspensionTelescopic forks
Rear SuspensionDual shocks, 5-way adjustable
Wheels & Brakes
Front Tyre4.10-19
Rear Tyre4.10-19
Front BrakesSingle disc
Front Brake Ø178 mm (7.0 inches)
Rear BrakesExpanding brake
Dimensions & Weight
Dry Weight203.0 kg (447.5 pounds)
Weight incl.220.0 kg (485.0 pounds)
Power/Weight0.2512 HP/kg
Seat Height780 mm (30.7 inches) If adjustable, lowest setting.
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.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
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.
