If you ride conservatively and keep tire pressure at 40 psi you may see 6/7k miles from the rear Stone. Your front Stone should deliver between 12/15k miles and that depends on keeping the pressure at 39/40 psi. If you run the recommended 36 psi on the front you can expect serious "cupping" at approximately 3k miles. Once it starts it's there to stay Where and how you ride will have a major impact on tire wear