I run these tires front and back and nuthings wrong with emm yet. I immediately compared these to my sucky Maxxis Holy Rollers. The E.S. has a really nice tread and doesnt wear down too easy, the original threads stayed on for a week if you can believe that! They also have a knurled surface on top of that so it grips wood, concrete and dirt really well. I can't give these tires full points though, i still need to test them when the tread wears down. 7 stars *******