With the depression biting, 1933 was the last year of production for dirt-track bikes, and the TT Replicas.
The Ulster 500 cc was fitted with a "semi-radial" (parallel valves with radial ports) cast-iron head.
For 1934 the Ulster had its head cast in aluminium bronze, and a radial four-valve 250 cc Sports was released.
Rudge motorcycles took the first three places in the 1934 Lightweight TT.

A two-valve 250 cc was produced in 1935, and in 1936 the last of the radial four-valve 250 cc model were produced, while round-tube forks were introduced on other models.
In 1937 the valve gear became fully enclosed on the 500 cc models, but finances were bad and Rudge was bought by EMI, and production was interrupted, being moved to Hayes, Hillingdon in Middlesex.

A 250 cc two-valve Sports was released in 1938, and for early 1939 the Ulster had an RR50 aluminium cylinder head.
Production ceased in December 1939, to convert to radar production for the war effort.
With the depression biting, 1933 was the last year of production for dirt-track bikes, and the TT Replicas. The Ulster 500 cc was fitted with a "semi-radial" (parallel valves with radial ports) cast-iron head. For 1934 the Ulster had its head cast in aluminium bronze, and a radial four-valve 250 cc Sports was released. Rudge motorcycles took the first three places in the 1934 Lightweight TT.
A two-valve 250 cc was produced in 1935, and in 1936 the last of the radial four-valve 250 cc model were produced, while round-tube forks were introduced on other models. In 1937 the valve gear became fully enclosed on the 500 cc models, but finances were bad and Rudge was bought by EMI, and production was interrupted, being moved to Hayes, Hillingdon in Middlesex.
A 250 cc two-valve Sports was released in 1938, and for early 1939 the Ulster had an RR50 aluminium cylinder head. Production ceased in December 1939, to convert to radar production for the war effort.
Rudge-Whitworth