The 1950s saw a slight shift in racing from open wheel to "fendered" cars. Big cars were still a very popular attraction on select Sunday afternoons, but Jalopy Stocks became the weekly division on Fridays. Stock Cars also made numerous appearances including the NASCAR Grand National division in 1954. On the open wheel side, sanctioning changed from AAA to the newly formed United States Auto Club (USAC) in 1956. Champ Cars ran at the speedway yearly until 1959 for the Indianapolis Sweepstakes race. AMA Motorcycles and Midgets were also recurring divisions throughout the 1950s.