Today's XC tracks have new and more extreme challenges, which means our tires need to be at peak performance for racing. Schwalbe knows this, which is why they reinvented the Racing Ralph Addix Evolution 29in Tire. It features grip edges along the center tread for rapid acceleration and exceptional grip, and Tubeless Easy technology enhances performance. Schwalbe designed this tire for the rear wheel for additional speed and control when we need it most.