Weirdly, it's actual black magic - the regular Marathons have the lowest rolling resistance of any touring tyre[0](lower than Schwalbe's own Marathon Racer lol)

Weirdly, it's actual black magic - the regular Marathons have the lowest rolling resistance of any touring tyre[0](lower than Schwalbe's own Marathon Racer lol), despite being very good at puncture proofing and not being completely slick. No idea how Schwalbe has actually done it. [0] https://www.bicyclerollingresistance.com/tour-reviews/schwalbe-marathon-2015 https://www.bicyclerollingresistance.com/tour-reviews/schwal...