Road Rocket SPECIFICATIONS, PRICE & IMAGES

Bike Features

Make Model:

BSA Road Rocket

Year:
1954 – 58

Engine:
Four stroke parallel twin cylinder, OHV

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.