Retail tire franchisor Big O Tires has expanded into Texas. Chris Monteverde, an existing franchisee of the Big O Tires brand with 19 locations in California, has added eight NTB Tire & Service Center shops in the San Antonio and Corpus Christi markets, which will be converted to Big O Tires over the next few months. Big O Tires now has more than 455 independently-owned and -operated locations across 25 states.