I bought two summer goodyear f1-gsd3 tires a while ago for a good price. They were made in 2005. The tires feel hard when i press on the tread with my finger nail. My finger nail will actually leave an indentation in the rubber, and the rubber will not reform immediately like on other all season tires I have in the basement. The basement is about 60 degrees. Is this normal? Does anyone know if they are suppose to be hard until they get up to opperating temps? all advice will be appreciated. I dont want to put hard brittles tires on the car and kill someone on the highway.