Originally Posted by BikeWNC

When tires, as the rear in the photo, get squared off as such, they might be ridden for more miles but they lose their cornering feel. My rear looked just like the one shown and I could tell on descents especially there was a more defined edge. I replaced them yesterday. Now I would normally move the front tire to the rear and put a new tire on the front but my LBS gave me a pair of Specialized Turbo Pro 25s to try so off came the Spec. Turbo Sworks 23s. I rode them today and they felt quite nice. I'll know more after tomorrow's 70 miler.