These are OE tires and quite amazing. I've used them at off road parks climbing muddy rocky hills and very rough trails. They do great - really great. Even in deep mud they pull me through. What is surprising is how quiet they are considering how aggressive the tread is. They do get a little louder as they wear down. I've climbed Mt Autero and other mountains in Colorado and these tires never flinched. If you know Mt Autero - the first mile or so is heavy rock and very punishing! I have about 20K on this set of four. They are worn some and have small nicks and cuts on the tread, but never a flat or a bead break. Great Tires, I'll be buying these again.