I know it's a broad question and many factors are involved. I'm converting my CRF450 and am planning on running open practices at Beaverun. From what I've seen, they don't usually open the dirt section for practice, so dirt traction isn't an issue. I was thinking that a quality set of DOT tires would be cheaper, have enough grip and have better longevity than slicks. Being a noob, I thought a little less grip than slicks might actually help me learn to slide a little easier. I did 2 open practices with a sportsman WR and was really surprised how much grip a skinny set of Cheng Shits gave, so any decent quality wide 17" tires should be an improvement. I'm sure alot of guys egos will convince them that they need slicks but I'll readily admit that Jeff Ward has nothing to fear from me. Any opinion from guys who have run both?