Firestone will continue to be the official tyre supplier of the IndyCar Series until at least the 2014 season.
The tyre firm returned to American single-seater racing in 1995 and has been IndyCar's sole supplier since the 2000 season.
The new deal also means that Firestone will also serve as title sponsor and supplier of the Indy Lights through this season.
"Firestone continues to be a great fit for our sport, carrying on a 100 year-old tradition that began at Indianapolis Motor Speedway," IndyCar CEO Randy Bernard said.
"When our new car takes its first competitive laps on the streets of St. Petersburg in March, all of our drivers will take great pride in knowing that they have a reliable tire designed to maximize performance."