The Ginetta GT5 Challenge, currently known as the Protyre Motorsport Ginetta GT5 Challenge for sponsorship reasons (It has also been previously known as the Ginetta 20 Challenge) is a one-make racing series based in the United Kingdom. The series uses the Ginetta G40 and Ginetta G20 race cars and thus has a two class system. The cars utilise sealed Ford Zetec 1.8-litre engine and tubular steel chassis, full integral FIA approved roll cage and fibre- glass shell which ensures safe, controlled racing.