I find they are terrible in muddy/slushy conditions. I did cross the simpson on them but they are chewed up and chopped out after about 20,000. I drive all sorts of conditions. Mud, sand rock and about 70% bitumen. I followed another car with Mickey thompsons and they really cleaned the tread as it went along. I find the mud stars dont do that. BFG or Mickeys for me, next.