Completely forgetting about the tire cracks (yes, I fight bouts of stupidity sometimes, on-set by the flock of small children in my house), I rode these tires about 25 miles over a pretty good course and they performed well. In fact, fully inflated, I couldn't even see the cracking, which is why I forgot about it. I'm still going to replace them, just because I want to more than anything else. I don't want a 20 mile walk, or a face plant or something else.