The right-rear tire on Tony Stewart's No. 20 Toyota exploded during practice Saturday at Texas Motor Speedway, forcing Stewart to a backup car for Sunday's Dickies 500. Robby Gordon will also start the race in a backup car after wrecking his primary No. 7 Dodge in the same practice. For continuing coverage of all the race action at TMS, check back at www.star-telegram.com/sports.


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