Kurtis Kraft was an American designer and builder of race cars, most notably the Kurtis 500S. The company built midget cars, quartermidgets, sports cars, sprint cars, Bonneville cars, and USAC Championship cars. It was founded by Frank Kurtis when he built his own midget car chassis in the late 1930s. Kurtis Kraft created over 550 ready-to-run midget cars, and 600 kits.