The spare tire stands for backup and preparedness — the reserve that lets you continue after a setback. Tradition reads it as the help or inner strength you can draw on when something gives out.
Where in your waking life have you met something like this lately?
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.