Why do tires slowly lose air? From what it seems, they are sealed and shouldn’t really be letting anything in or out, but they still need to be refilled every now and then.

Question

I understand pressure changes as heat changes, but even in the same season you will still lose a slight amount of pressure.

In: 141

Answer 1

The weird thing is spare (donut) tires never seem to experience this issue. Can leave those bad boys in a truck for 10 years and always seem to be fully inflated.