The XR-1 rear is the original Bulldog. This rear is the choice of top racers like Greg Hodnett, Craig Dollansky, Jon Stanbrough and Tony Stewart. The strength and reliability of the XR-1 is unmatched by the competition. The XR-1 has been the most dependable rear in the sport since its introduction in 2004. From Saturday Night racers to the sport’s top professionals, the XR-1 has proven to be the choice of champions when reliability, durability and performance are required.