Terrier (T15)

Terrier (T15)

Terrier Info

In the early 1950s there was a multitude of small two-stroke, ride-to-work machines for people to choose from and buy, but Triumph decided to be different and in 1952 at the Earls Court Show they re-entered the market for lightweight commuter machines with the introduction of the 149cc Terrier. It was also a four-stroke machine just like the firm’s larger models and resplendent in its Amaranth Red livery, it was for all the world a Speed Twin in miniature!

Edward Turner had insisted any new Triumph model had to be faster than rival small machines, look like the rest of the Triumph range, and be charming enough to keep riders loyal when they wanted a new or larger machine. The simple, compact, unitary construction (the first for Triumph) but powerful single-cylinder engine with integral four-speed gearbox was then fitted into a plunger-suspended frame.

Not only was the new Terrier well capable of carrying a passenger (when the option of a dual seat was specified) but more importantly, it fitted nicely in the then current below 150cc Road Tax bracket. An important consideration in those post-war years when austerity was prevalent, and needless to say the Terrier was an instant hit being by far the best looking lightweight motorcycle at the time.




24th July 1953


25th July 1956


102 to 26162 (not continuous)



Single cylinder OHV - unit construction


149cc (9.09 cu in)

Bore / Stroke:

57mm x 58.5mm

Compression Ratio:

7 : 1


8 bhp (6 kW or 8.1 PS) at 6,500 rpm


AMAL 332/1 (1953 to 1954)

AMAL 332/2 (1954 to 1956)


Wet multiplate



Cycle Parts

Front Suspension:

Telescopic forks

Rear Suspension:


Front Wheel:

19 inch

Rear Wheel:

19 inch

Front tyre:

2.75 x 19 inch

Rear tyre:

2.75 x 19 inch

Petrol Tank:

2.625 UK gallons (3.15 US gallons or 11.92 litres)

Oil Tank:

2.25 UK pints (2.7 US pints or 1.28 litres) (1955 model)

2.75 UK pints (3.3 US pints or 1.56 litres) (1956 onwards)


1/3 UK pint (0.4 US pints or 0.19 litres)

Primary Chaincase:

1/2 UK pint (0.6 US pints or 0.28 litres)



Lucas Ignition Coil

On early machines the ignition coil was mounted under the seat, then on later machines it was on the rear mudguard, behind the gearbox.



Charging type:

Alternator / rectifier