What Dallara chassis model debuted at the 2012 Indianapolis 500?

The Dallara chassis model that debuted at the 2012 Indianapolis 500 was the Dallara DW12. Formally known as the Dallara IR-12, it replaced the nine-year-old Dallara IR-05 as IndyCar’s standard chassis for the 2012 season.

The car was developed under IndyCar’s ICONIC initiative, which aimed to make the series more affordable, safer, and technically modern. Dan Wheldon conducted the chassis’s first official test in 2011. After Wheldon’s death in the 2011 Las Vegas race, Dallara named the new car DW12 in his honor.

The DW12 actually made its first race start at the 2012 Honda Grand Prix of St. Petersburg, where Hélio Castroneves won. Its Indianapolis debut came later that season at the 96th running of the 500. The chassis became easy to confuse with its aerodynamic body kits, since Honda, Chevrolet, and Lotus-associated packages could give cars different appearances while sharing the same core safety cell.

The DW12 remained IndyCar’s foundation for more than a decade, making it one of the longest-serving chassis designs in series history.