All cars in the Champ Car series are required to race on Bridgestone Potenza tires. Each car is also required to use at least one set of the softer (and therefore grippier) Bridgestone alternate tires--or "reds"--during the course of the race. This color-coding of tires is intended to give spectators a better idea of race strategy, and has been adopted by Formula One this year.
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