Upgrading an icon is never easy. The BT46 replaces the BT45 as Bridgestone's premier Bias-Ply vintage sport and touring tire. The BT46 improves wet grip without sacrificing wear life or handling characteristics. Bias-Ply Tire designed for vintage sport and touring motorcycles. New Silica single compound in the rear to maximize performance, grip, and wear. Increased wet performance. No sacrifice in wear life