Schwalbe Marathon Plus Tire - 700 x 45 Clincher Wire BLK/Reflective Performance Endurance SmartGuard E-50Schwalbe Marathon Plus Tire 700 x 45 Clincher Wire Black Reflective Performance Endurance SmartGuard E 50. The Schwalbe Marathon Tires incorporate light reflecting sidewalls for better visibility and also utilizes a Silica compound for easy rolling and longer life. SmartGuard puncture protection to resist thorns shards and even thumbtacks Marathon Silica compound for easy rolling and longer life Reflex sidewalls incorporate light reflecting bands TECH