Ariel Square Four G

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Ariel Square Four G
Production 1936
Class Classic
square four, four stroke, air-cooled, OHV
Compression ratio 7.2:1
Horsepower 45.06 HP (33.6 KW) @ 5500RPM
Transmission Gear box: 4 Speed
Final Drive: Chain
Suspension Front: Telescopic Fork
Rear: Twin link-and-plunger units
Brakes Front: Drum
Rear: Drum
Front Tire 3.25x19
Rear Tire 4.00x18
Wheelbase 55.98 inches (1422 mm)
Length 82.01 inches (2083 mm)
Width 32.01 inches (813 mm)
Seat Height 30.0 inches (762 mm)
Weight 193.0 kg (wet)
Manuals Service Manual

The Ariel Square Four G was a square four, four stroke, air-cooled, OHV Classic motorcycle produced by Ariel in 1936. Claimed horsepower was 45.06 HP (33.6 KW) @ 5500 RPM.


The bike has a 4 Speed transmission.


It came with a 3.25x19 front tire and a 4.00x18 rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Telescopic Fork while the rear was equipped with a Twin link-and-plunger units. The wheelbase was 55.98 inches (1422 mm) long.

1936 - 1949 Ariel Square Four G[edit]

1936 - 1949 Ariel Square Four G 1936 - 1949 Ariel Square Four G 1936 - 1949 Ariel Square Four G 1936 - 1949 Ariel Square Four G 1936 - 1949 Ariel Square Four G

The first Ariel Square Four 4F was presented in 1930, having an engine of 500cc. In 1931, the engine grew to 601cc. The year 1937 came for the Square Four with a changed engine with a displacement of 995cc, whose production lasted till 1949. At the beginning of the '50's, a Square Four I with 35 hp ( 26.09 Kw) at 5500rpm was produced. This bike was able of running with 90mph. Its brother, the Square Four Mark II, built from 1953 to 1959 had the same 997cc engine and its speed was of 160 Km (100 mph). In 1954 there was a Mk3 prototype which, unfortunately, never saw the roads. After this experiment, the Square Four production ceased in 1959.