Aero and tire specs for Iowa

The Firestone tire specification features the same left-side tires used at Iowa Speedway in 2012, combined with the same right-side tires run three weeks ago at Texas Motor Speedway.

Because of the higher constant speeds and loading placed on the cars, a more durable superspeedway tire specification is necessary.

Aerodynamic specs remain the same as written in the 2013 IZOD IndyCar Series rulebook. Mandatory parts: road/street course mainplane, rear flap 34.00 degrees maximum, standard rear wheel guard, underwing strake, front brake backing plate. Optional parts: Radiator inlet shutter, rear wing wicker.

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