| MODEL | BSA A10 ROAD ROCKET 650 1954 - 1958 |
| Year | 1954 - 1958 |
| Engine Type | Four stroke parallel twin cylinder, OHV |
| Displacement / Capacity | 646 cc / 39.4 cu in |
| Bore X Stroke | 70 x 84 mm |
| Compression Ratio | 7.2:1 |
| Cooling System | — |
| Max Power | 30 kW / 40 hp @ 6000 rpm |
| Max Torque | — |
| Ignition | Lucas magdyno |
| Induction | Amal carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4 speed |
| Clutch | Multi-plate with built-in cush drive |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Welded seamless steel tubing, duplex downtubes, full cradle engine support, bolted-on rear sub frame |
| Front Suspension | Telescopic forks with coil spring, hydraulically damped |
| Rear Suspension | Swinging arm (plunger type on earlier A10s) |
| Front Brakes | Drum, 8 in |
| Rear Brakes | Drum, 7 in |
| DIMENSION SPECS | |
| Overall Length | 2100 mm / 84.0 in |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1391 mm / 54.75 in |
| Ground Clearance | — |
| Dry Weight | 190 kg / 418 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25 x 19 in, ribbed |
| Rear Tyre | 4.00 x 19 in |
| FUEL SYSTEM | |
| Fuel Capacity | 16 Litres / 4.2 US gal |
| Fuel Consumption | 5.6 L/100 km / 42 US mpg |
| Top Speed | 175 km/h / 109 mph |
The Road Rocket was the sporting version of BSA's 650 A10 twin, the first one to get an aluminium cylinder head. Higher-compression pistons and a hotter camshaft gave it more punch than the touring Golden Flash it was based on, while keeping the long-legged character of the A10 range.
