My tires are not Marathon Racer, but just plain Schwalbe Marathons with Greenguard for puncture protection. I am very very pleased with these tires. Schwalbe tires are well made, long wearing and I have yet to get a flat with them. With the previous (stock) tires flats were all too frequent here in Idaho where they use gravel on the roads in winter for traction for cars but don't sweep the gravel away in the spring. Would highly recommend Schwalbe.