Upcoming Events

Apr
27
Sat
9:00 am The 39th Carole Nash Internation... @ Staffordshire County Showground
The 39th Carole Nash Internation... @ Staffordshire County Showground
Apr 27 @ 9:00 am – Apr 28 @ 5:00 pm
A flagship event of the classic motorcycling calendar, the Carole Nash International Classic MotorCycle Show is well into its fourth decade and is still going strong. Welcoming the very best that classic British motorcycling has[...]
Jun
7
Fri
all-day North Wales Rally @ Station Campsite
North Wales Rally @ Station Campsite
Jun 7 – Jun 9 all-day
North Wales Rally @ Station Campsite
The North Wales group of TR3OC are pleased to announce a new event planned for 2019. The dates are now confirmed and bookings being taken for the 7th, 8th & 9th of June. The Rally[...]
Jul
25
Thu
all-day Beezumph 28 2019 @ Cadwell Park Race Circuit
Beezumph 28 2019 @ Cadwell Park Race Circuit
Jul 25 – Jul 26 all-day
Beezumph 28 2019 @ Cadwell Park Race Circuit | Wales | United Kingdom
The TR3OC Committee would like to announce that this years BEEZUMPH RALLY will take place at Cadwell Park on the 25th and 26th of July. Hope to see you there.

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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