A tire carries the whole vehicle, so tradition reads it as stamina and support. A flat or burst one stands for a sudden loss of energy or a plan that has stalled.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.