BSA A75 Rocket III (1968-75)

The BSA/Triumph Rocket III motorcycle was produced between 1968 and 1975, with a total of 27,480 units made. It featured a four-stroke, transverse, inline triple engine with a capacity of 740cc and a compression ratio of 9.5:1. The bike had a dry sump lubrication system, a 12V battery, and a kick start. It could produce a maximum power output of 44 kW or 60 hp at 7250 rpm, and a maximum torque of 61 Nm or 45 ft/lb at 6900 rpm. The transmission was a 4-speed, with final drive via chain. The bike had a double loop cradle frame, telescopic forks with a coil spring and hydraulic damping in front, and a coil spring/hydraulically damped rear suspension. Prior to 1971, the front brake was a drum, but from 1972-75 it was a disc. The wheels were steel with wire spokes and both front and rear tires were 4.10 x 19 in. The bike weighed 206 kg or 455 lbs in dry weight and had a fuel capacity of 19 L or 5.0 US gal. It could reach a top speed of 185 km/h or 115 mph and had an acceleration of 0-100 km/h or 0-60 mph in 5.5 or 5.2 seconds, respectively. It was available in a ruby red/silver color scheme.

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Technical specifications:

Make Model: BSA/Triumph Rocket III

Year: 1968 – 75

Production: 27 480 units

Engine: Four stroke, transverse, inline triple, OHV, 2 valve per cylinder

Capacity: 740cc / 45.2 cub in.

Bore x Stroke: 67 x 70mm

Carburetor: 3 x Amal 26 mm concentric

Cooling System: Air cooled

Compression Ratio: 9.5:1

Lubrication: Dry sump

Oil Capacity: 2.8 L / 6 US pints

Exhaust: 3-into-2, stainless steel

Ignition: Twin coil

Spark Plug: Champion N4

Battery: 12V

Starting: Kick start

Max Power: 44 kW / 60 hp @ 7250 rpm

Max Torque: 61 Nm / 6.2 kgf-m / 45 ft/lb @ 6900 rpm

Clutch: Dry single plate

Transmission: 4 Speed

Final Drive: Chain

Frame: Double loop cradle frame

Front Suspension: Telescopic forks with coil spring – hydraulically damped

Rear Suspension: Coil spring/hydraulically damped

Front Brakes: Prior 1971: Drum 1972 – 75: Disc

Rear Brakes: Prior 1975: Drum 1975: Disc

Wheels: Steel, wire spokes

Front Tyre: 4.10 x 19 in., K81

Rear Tyre: 4.10 x 19 in., K81

Wheelbase: 1430 mm / 56.3in.

Ground Clearance: 178 mm / 7.0 in.

Dry Weight: 206 kg / 455 lbs

Wet Weight: 226 kg / 498 lbs

Fuel Capacity: 19 L / 5.0 US gal

Top Speed: 185 km/h / 115 mph

Acceleration: 0 – 100 km/h 0 – 60 mph: 5.5 sec 5.2 sec

Colours: Ruby red/silver