I have hit over 500 miles and i know thats not alot but its a start, i have driven down muddy logging roads an through muddy fields and i had no problems, i was amazed how well they cleaned out, they cleaned out before I got to the highway and didnt throw mud all over my jeep, which is what they were advertised to do, they also do not pick up much gravel in the tread but if it does pic up a few pieces they are quick to clean put the rocks, i pulled a 19 foot fiberglass boat with my jeep and they definatly helped me stop an slow down, the boat ramp was wet grass and very steep and i didnt spin tires at all, i had to pull a truck out o a field and again they didnt spin they grab extremely well! so far so good no signs of where or any other problems they are still quiet and ride really good! I would advise anybody to get these! I have 0 complaints! I am sorry to say no real tests yet thats it so far