My Stock rear Dunlop lasted 4,200mi before finnaly showing a complete smooth spot in the center. I do mostly vertical rideing back and forth to work through town, and long trips, but love taking the twisties when possible. I figured the 021 would be perfect for me sence its got the harder compound in the center, and softer on the sides for when i hit twisties. I havent heard to much about reviews on the 021, but figured i'd give it a try. Tire life should be doubled compared to the stock dunlop. I only have about 12miles on the new 021, and its still showing all the nubs....