I checked the pressure in my spare and it was flat. Filled it up and the wife drove off in the car. When she came back, she reported she heard a load hiss like an air leak. Looked at the spare and it was flat. Dropped the spare and looked at the tire. it had a bulge about 6" wide and the bead was away from the rim. Replaced the tire and the rubber was removed down to the cords which were rusty. This spare had never been on the ground! The wife bought the car brand new. I was wondering if the tire was defective from day one. I was sure surprised by this and glad we never needed to use the spare in the last 11 years!