In the years following the Second World War, many motor racing enthusiasts keen to try their hand at the sport were left disappointed by prohibitive costs. However, the innovative efforts of the '500 Club' saw the development of racing cars with smaller engine capacities, significantly reducing financial outlay and ultimately bringing motor racing within the reach of a greater number. The idea proved highly successful, and within a few years the 500cc category was accorded international status and Formula Three racing was thriving. This book outlines the history and development of the 500cc racing car, and explains its extraordinary popularity during an important era of motor racing evolution.