BSA Road Rocket
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Make Model | BSA Road Rocket |
Year | 1954 - 58 |
Engine | OHV Parallel twin |
Capacity | 646 cc / 39.4 cub in. |
Bore x Stroke | 70 x 84 mm |
Carburetor | Amal |
Cooling System | Air cooled |
Compression Ratio | 7.2:1 |
Lubrication | Dry sump |
Exhaust | Twin, stainless steel |
Ignition | Lucas magdyno |
Battery | 6V |
Starting | Kick start |
Max Power | 30 kW / 40 hp @ 6000 rpm |
Clutch | Multi-plate with bult-in cush drive |
Transmission | 4 Speed |
Final Drive | Chain |
Gear Ratio | 1st 11.68 / 2nd 7.96 / 3rd 5.48 / 4th 4.53:1 |
Frame | Welded seamless steel tubing with duplex downtubes and full cradle engine support, bolted-on rear sub frame |
Front Suspension | Telescopic forks with coil spring - hydraulically damped |
Rear Suspension | None or Plunger-type, with shock and rebound springs, undamped. From 1954: Swinging arm |
Front Brakes | Drum, 8 in. |
Rear Brakes | Drum, 7 in. |
Wheels | Steel, wire spokes |
Front Tyre | 3.25 x 19 in., ribbed |
Rear Tyre | 4.00 x 19 in. |
Dimensions | Length: 2100 mm / 84.0 in. |
Wheelbase | 1391 mm / 54.75 in. |
Dry Weight | 190 kg / 418 lbs |
Fuel Capacity | 16 L / 4.2 US gal |
Average Fuel Consumption | 5.6 L/100 km / 17.9 km/l / 42 US mpg |
Top Speed | 175 km/h / 109 mph |
Standing Quarter Mile (400 m) | 16 sec. |
Colours | All over gold, Black/chrome |
Source | Wikipedia |
The A10 had a reputation for reliability but was struggling to compete against the Triumph engines and the Norton Featherbed frames. Advertised by BSA in 1954 as 'undoubtedly the worlds greatest motorcycle' the Road Rocket was discontinued in 1958 when it was replaced by the BSA Super Rocket.
Launched as the top of BSA's range in 1954 the BSA Road Rocket had an A10 engine with an alloy cylinder head, high compression pistons and a high lift camshaft, giving 40 bhp (30 kW) and a top speed of 109 mph (175 km/h).