Single-make championships by Renault have been some of Europe’s most approachable lower-level road racing series for nearly six decades. Originating in 1966 in France with the Gordini, the first-generation Clio debuted in 1991, by which point most major European countries had a series of their own. After a brief hiatus, the Clio became the marque of choice once again in the early 2000s, and has be...