The story
Founded by Daniel Rudge in 1894.1
Rudge bikes finished first, second and third at the 1930 Junior TT using prototype radial 350 cc 4-valve engines. They also took first and second in the Senior TT. The road bike engines were changed to dry sump lubrication. The JAP 250 and the parallel four-valve 350 cc ended production in this year.
In 1931 Rudge released its first 250 cc and 350 cc road machines with the radial-valve layout. TT Replicas were available in 350 cc and 500 cc. The parallel-valve 500 cc was also available in Special and Ulster models, the Ulster now having a 100 mph guarantee. First and second were taken in the 1931 Lightweight TT, and in 1932, second and third.
A radial-head 500 cc was produced for 1932 only. A 250 cc TT Replica was built, and the road bikes were fitted with proper oil bath primary chains, and a stand that could be operated "with just one finger".
From Wikipedia’s article on Rudge-Whitworth, shared under CC BY-SA 4.0.4