After the close of the First World War, the British motorcycle industry rose to prominence as British motorcycles became almost unbeatable in competitions. However, a shortage of these new model bikes pushed prices to a premium and most people were forced to settle for pre-war designs. These high prices led to greater competition, and greater competition lead to swifter and more innovative development. By the mid 1920s the overhead valve engine came into its own, with enhanced performance, and then the overhead camshaft engine allowed even greater potential. Internal expanding hub brakes kept safety in step with increased performance. The later 1920s brought about further significant changes when wired-on tyres came into general use and electric lighting replaced acetylene lights. Appearance was improved when chromium plating took the place of nickel and the saddle tank rendered the old flat tank superfluous.