Since 1997 Dallara has supplied the cars for Indycar, the open-wheel cars American Championship. Since 2006 Dallara has been the sole supplier for this series after having routed various American and English manufacturers. The Indycar, initially named the Indy Racing League (IRL), in 2008 integrated the CART-Champ Car and created a single championship, the Indy Car Series, to which Dallara is the sole supplier. In 2019 Roger Penske acquired the ownership of the Indianapolis Speedway from the Hulman-George family.
The Indy 500, one of America's national historical landmark, takes place every May on the eve of Memorial Day. This event takes place on the famous oval circuit of Indiana which is 4023 meters long. The first edition of the race dates back to 1911, and to this day it is the most eagerly awaited motorsport event in the USA, followed by an audience of 250 thousand spectators. The first victory of a Dallara at the Indy 500 was in 1998 with the Italian-American Eddie Cheever driving the Oldsmobile motorized IR8 Dallara, and since then Dallara has triumphed 21 times and counting.