Classic Endurance Racing (commonly abbreviated as CER) is a sports car racing series founded in 2004 by Peter Auto Ltd. It features classic sports cars and its aim is to support the endurance racing revival.
The series consists of events in various European countries. It currently consists of five rounds as a support event for the 2009 Le Mans Series season. Each race is one hour long.
All cars are to be manufactured between the years 1966 and 1979 and consist of four classes, Proto 1 and Proto 2, which consist of Group P and S cars with either +2.0L or -2.0L size engine. There are also two grand tourer classes, GT1 and GT2.