I've had a bout the same kind of flat frequency with the Marathon Racers as JB Greens. The Racers do have a nice ride and I think they roll faster than the JB's. My experiece was with a 38mm Racer. I'm now thinking of getting the 30mm Racers for my Rando bike to replace GB Cypres's. The rear just developed a large casing seperation after about 700 miles making it unridable. Now those are delicate tires. ~mike
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