| MODEL | SUNBEAM S7 500, S7 500 DE LUXE 1946 - 1956 |
| Year | 1946 - 1956 |
| Engine Type | Parallel twin, SOHC, four-stroke |
| Displacement / Capacity | 487 cc / 29.7 cu in |
| Bore X Stroke | 70 x 63.5 mm |
| Compression Ratio | 6.5:1 |
| Cooling System | Air/oil cooled |
| Max Power | 18.6 kW / 25 hp @ 5800 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | — |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 4-speed |
| Clutch | Single plate, dry |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | Twin cradle, steel |
| Front Suspension | Telescopic, one-way damped |
| Rear Suspension | Plunger, spring-loaded saddle |
| Front Brakes | Drum, leading shoe, 203 mm / 8 in |
| Rear Brakes | Drum, leading shoe, 203 mm / 8 in |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1400 mm / 57 in |
| Ground Clearance | — |
| Dry Weight | 195 kg / 430 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 4.50 x 16 in |
| Rear Tyre | 4.75 x 16 in |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | 121 km/h / 75 mph |
Photo: SG2012, CC BY 2.0, via Wikimedia Commons
Photo: Vauxford, CC BY-SA 4.0, via Wikimedia Commons
Sunbeam's post-war shaft-drive tourer, an all-aluminium overhead-cam parallel twin on balloon tyres with plunger rear suspension, built by BSA's Sunbeam arm. Early bikes vibrated badly and lacked fork damping, and the heavy, wallowy handling and high price kept sales modest. The De Luxe added trim and colour options.
