Dallara IR-03

Dallara IR-03/04/05^{kW) on push-to-pass}
Weight	1,525–1,565 lb (692–710 kg) on ovals; 1,600–1,640 lb (726–744 kg) (road and street courses)
Fuel	100% methanol (2003-2005) ; EPIC 10% ethanol + 90% methanol (2006) ; EPIC 98% ethanol + 2% gasoline (2007-2009) ; Sunoco 98% ethanol + 2% gasoline (2010-2011)
Lubricants	Various per teams
Tyres	Firestone Firehawk
Competition history
Debut	2003 Toyota Indy 300

The Dallara IR-03, and its evolution, the Dallara IR-04/05, is an open-wheel formula racing car developed and produced by Italian manufacturer Dallara for use in the IndyCar Series, between 2003 and 2011.^[8]^[9]

Starting from 2007 season, all IndyCar Series entrants (outside the Indy 500) utilized the IR-05 chassis version after Panoz defected to Champ Car World Series to replace Lola as the spec chassis supplier for that series in the same season. In 2009 one year after IndyCar unified with Champ Car all entrants (including entrants for the Indy 500) used the IR-05 making it the only chassis used in IndyCar from 2009 to 2011.