? The PBR RAM Challenger Series is the top expansion series of the PBR. It features some of the best athletes of the sport going head-to-head with the fiercest bulls in the country. The PBR RAM Challenger Series will bring all the high-energy sound, lighting, special effects, and edge-of-your-seat action that fans have come to expect from the World leader in the sport of bull riding. ? The PBR is NOT a rodeo format ? it?s two hours of pyro, music and the most intense bull riding action the world has to offer, filled with heart-pounding, bone-crushing action, and a star-studded line up of the world?s best riders and animal athletes.