The crew of the Dario Franchittidriven Target Chip Ganassi #10 car changes to the alternate red-sidewall tires on the St. Petersburg, Fla., temporary street course during the 2009 seasonopening race. The “red” tires use a softer rubber that grips better but wears more quickly, so teams must deploy them strategically throughout practice, qualifying, and racing for the best positional or overtaking advantage. (Photo credit: Jim Haines)