GP5000, the 4000 IIs were nice and the 5000 have been nicer. Unfortunately they don't make them in a 650c or 26" so my kid is stuck on some nicer michelin but not as nice as I'd like. They get good reviews, I have them on my wife's and my bike and of the three listed I believe they are the fastest all around tire. Either that or I'd do a pair of Challenge. Really wish there were nicer tires in smaller Jr. sized wheels.