These tires are by far my favorite yet. I've had the assassinator tires before I choose these because the lug is thicker and shorter. The assassinators will tend to wander driving on hard surface. I bought these R4 tires to replace my Outback Max tires because the Outbacks pulled my can am down when I'm thick mud and didn't clean out the best. These don't ride rough but at 15 mph you will get a bit of vibration but I'll give up ride quality on hard ground if I can go through anything!