The lugs are directional. If you check out the Y shaped lug in the middle of the tire you will get what I mean. With the Y facing one way, I found better traction when it was a big dusty. Facing the other direction I found more grip when our clay track got a bit wet. Unfortunately, I don't remember which way was which. Doesn't matter at this stage though. You just need to make sure you mount them up so the Y's are facing the right way and then you can swap them side to side to change the direction of the Y.