Well, I just learned something by reading this thread. I've had my Hammer for just over a year and put about 4,500 miles on it in that time. The bike had 700 on it when I got it, so that means the 250 back tire has more than 5,200 miles on it. I just noticed for the first time the other day that the tire IS looking kinda flat across the middle. So the point is I guess I'm due, or close to it, for a tire change. But I will say that I haven't noticed any difference in handling, and I love leaning in the curves, too. I had no idea how long these tires last. I was honestly thinking they were good for many, many more miles...but I guess not.