I've been a defender of the stock tires, they stick well enough for me both dry and wet. Yesterday I was down on the ground doing the vacuum hose mod and noticed that the tires already beginning to crack, or show signs of dry rotting. I've only got 2300 miles or so and the bike is a couple months old. The tire pressure was just a tad low, less than a few psi. Bummer. I'll keep on using them until they start to suck.