Schwalbe Marathon Racer HS 429 SpeedGrip Cross/Hybrid Bicycle Tire - Wire Bead - Reflex - 20 x 1.50 Schwalbe, Marathon Racer, 20x1.50, Wire, Road Star, Clincher, Race Guard, 67TPI, 55-85PSI, Black One of the lightest and fastest tire in the marathon Series Speed guard protection provides the highest level of puncture protection offered by Schwalbe