Schwalbe Marathon Efficiency Tire - 700 x 38 Clincher Folding BLK/Reflective Evolution Line Super Race Addix Race E-50Schwalbe Marathon Efficiency Tire 700 x 40 Clincher Folding Black Reflective Evolution Line Super Race Addix Race E 50. The Marathon Efficiency is a state of the art touring tire that sets standards for others to follow. Sporty design and high versatility High quality technology that has been tried and tested by professional athletes in World Cup races Schwalbes fastest touring tire to date with the lowest rolling resistance increased battery range