Upcoming Events

May
8
Fri
all-day ***Postponed***”Race the Waves” ... @ Bridlington
***Postponed***”Race the Waves” ... @ Bridlington
May 8 – May 10 all-day
***Postponed***"Race the Waves" Bridlington @ Bridlington
TR3OC field a team of 3 3-cylinder-engined machines at Race the Waves, Bridlington, 8th to 10th May 2020 The TR3OC will this year field a team of 3 machines and have a cub stand at[...]
Jun
5
Fri
all-day 2nd North Wales Rally @ Station Campsite
2nd North Wales Rally @ Station Campsite
Jun 5 – Jun 7 all-day
2nd North Wales Rally @ Station Campsite
Thank you for wanting to join the North Wales branch of the TR3OC at our 2nd North Wales Rally on June 5/6/7. We are planning to spend a weekend in beautiful countryside enjoying great company,[...]
Jun
6
Sat
all-day ***Cancelled***Coventry Motofest @ Coventry City Centre
***Cancelled***Coventry Motofest @ Coventry City Centre
Jun 6 – Jun 7 all-day
***Cancelled***Coventry Motofest @ Coventry City Centre
MotoFest Coventry 2020 Two days of non-stop cultural celebration and motoring madness. A weekend of free family fun in the UK’s Motor City Contact-Nigel Wheatley 01902 331105

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BSA Rocket 3

BSA Rocket 3 (A75)

The bike was originally to be called the BSA A75 Tri Star but this was subsequently changed to Rocket 3.  The Rocket 3 is in most respects the same as the Triumph Trident T150.  It differs in having cylinders inclined at fifteen degrees from the vertical and the use of a twin down tube frame.  As with the Triumph variant, Ogle styling was adopted.

1969-bsa-rocket3

1969 BSA Rocket 3

Engine

OHV air cooled transverse 3 cylinder

Bore and stroke 67 x 70mm

Capacity 741cc

Compression ratio 9.5:1

Claimed output 58bhp @ 7250rpm

Carburation 3 x Amal 27mm concentric

Raygun silencers

Transmission

Endless triplex chain primary drive

Borg & Beck single plate dry clutch

Four speed constant mesh gearbox

Frame

Duplex cradle, all welded tubular

Suspension

Triumph type telescopic front forks

Girling rear shock absorber struts

Wheels and Tyres

Front rim WM2 x 19”

Rear rim WM3 x 19”

Front tyre 3.25 x 19” Dunlop K70

Rear tyre 4.10 x 19” Dunlop K81

Brakes

Front 8” dia. Twin leading shoe drum

Rear 7” single leading shoe drum

Tank capacities

Fuel 4.25 gallons

Oil 5 pints

Electrical

12V 8Ah battery

Lucas 120W alternator

Lucas rectifier and zener diode regulator

Dry weight

470lb

Colour Schemes

Black frame, Flamboyant Red or Flamboyant Blue

 

1970 changes

4.10 x 19” Dunlop TT100 front tyre

Revised gearbox ratio – 3rd gear lowered slightly

1971 changes

Optional 5-speed gearbox

Conical hub front and rear brakes

No front fork gaiters, Girling exposed spring rear units

Direction indicators

Colour scheme, Flamboyant Red/Flamboyant Blue/Firecracker Red. Frame Dove Grey

1972 changes

5-speed gearbox is fitted to some BSA A75

Colour scheme, black frame, Burgundy