Well, after over 18,000 miles with a little bit of meat left, I decided to replace it. It's pretty close to the wear bar but I didn't want to wait until later. Number one reason is that I ride even when the temperature is in the 20's like this morning. I didn't want to take a chance riding on it. The front however, is still in good shape also with over 18,000 miles on it. For those of you that missed my post when I mounted the set when she had 16,100 miles on her, she now has over 34,200 miles on her. Like I've said before, these tires are simply amazing.