I used to get a flat a week on average but since I put an armadillo on the back that has stopped. I have not had a flat on the back tire since I put the Aramdillo on over 1000 miles ago. This makes it the longest lasting rear tire I have ever had. Most of my rear tires (Continental 2000, hutchison, Etc) suffered failures (due to road debris) in the sidewall (the contis) or a gash in the tread. The Armadillo seems to be doing the trick for me. Looking forward to many more miles on it!