The Thunder in the valley series title sponsor this year is Maxxis Tire. It’s a fast growing series out here in southern California . The series has picked some great sponsors including Alba , Galfer, Laegers, IMS, Triump Motorsports and many more.. Turnout for events averages around 75. They have classes for just about all levels and abilities. This first article will highlight some of the classes and different tracks this series travels to.