Using Renault 4CVs, Rédélé gained class wins in a number of major events, including the Mille Miglia and Coupe des Alpes. As his experience with the little 4CV built up, he incorporated many modifications, including for example, special five-speed gearboxes replacing the original three-speed unit. To provide a lighter car he built a number of special versions with lightweight aluminium bodies: he drove in these at Le Mans and Sebring with some success in the early 1950s.