Several years ago I bought a set of Bridgestone tires. They had a 50% replacement cost warranty if they did not deliver the mileage stated. They wore out early so I went back to the store, they refused to honor the warranty because there was still a little tread left but not much! Certainly if I brought the car in to buy tires they would have told me they were shot! So I thought to complain to Firestone but first wanted to wear them bald so there would be no excuse. Firestone told me to bring them to a local company owned store and give them this email. I did. The Manager told me since they are bald he couldn't measure the tread depth with his gauge. I of course countered then it had to be less than acceptable, he agreed but since he couldn't measure it, he can't give me a credit. I never emailed Firestone about this Manager.