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The tire rule is sets under caution. It is either 2 or 3 sets depending on how hard the track is on tires. Teams can change tires under green but it doesn't happen very often. Most Busch teams probably have only one extra set of tires in their pits for the race. Cup teams can change as often as they like and may use as many as 14 sets of tires during a race.
Both the Busch and Winston Cup have a 12:1 compression ration. Winston Cup cars weigh 3400 lbs without the drive and Busch cars weigh 3300 lbs. The body length is the same 200.7 inches but the wheel base is 110 inches for Cup and 105 for Busch. Cup cars have to be a minimum of 51 inches high (roof height) and Busch cars 50.5 inches. The spoilers are different by series and by make.
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