My dad has 20,000 miles on his original front tire when we swapped it, based on a tread depth measurement I believe he could have gone another 4 - 5,000. His present tire has just a shade over 16,000 miles on it and still looks pretty good. When we get ready to put it to bed this winter I'll be checking the tread depth and we'll decide whether to run it longer or just change it. I'm betting based on the performance of his 1st tire we should expect nothing short of the same 20 - 25,000 life.