| MODEL | NORTON COMMANDO 850 INTERSTATE 1975 |
| Year | 1975 |
| Engine Type | Four stroke, parallel twin cylinder, pushrod, 2 valves per cylinder |
| Displacement / Capacity | 829 cc / 50.6 cu in |
| Bore X Stroke | 77 x 89 mm |
| Compression Ratio | 8.5:1 |
| Cooling System | Air cooled |
| Max Power | 44.7 kW / 60 hp @ 6200 rpm |
| Max Torque | — |
| Ignition | 120W Lucas alternator |
| Induction | 2 x Amal carburettors |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4 Speed |
| Clutch | Metal diaphragm clutch |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Twin downtube cradle with Isolastic engine mounts |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swing arm with Girling coil springs |
| Front Brakes | Single disc |
| Rear Brakes | Single disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 233 kg / 514 lbs |
| WHEEL SPECS | |
| Front Tyre | 4.10-19 |
| Rear Tyre | 4.10-19 |
| FUEL SYSTEM | |
| Fuel Capacity | 19 Litres / 5.0 US gal |
| Fuel Consumption | — |
| Top Speed | 185 km/h / 115 mph |
The Interstate Mk III was the final development of the Commando, with electric start and a quieter, more civilised 829 cc engine. It was heavier and gentler than earlier Commandos, trading some acceleration for refinement, and was praised for handling and braking. Production ended as the company ran into financial trouble.
