Why is there water under the spare tire?

[McEli]

It indicates a trunk water leakage issue that should be promptly inspected. Expanded information about spare tires is as follows: 1. Definition: A spare tire refers to a backup tire for passenger cars, with specifications identical to the original vehicle tires. However, some vehicles use specially colored wheel rim spares, compact spares, foldable spares, or run-flat tires to remind owners to inspect and replace faulty tires promptly. 2. Classification: Full-size spare tire: This type has identical specifications to the other four tires on the vehicle and can replace any temporarily or permanently unusable tire. Non-full-size spare tire: These spare tires have slightly smaller diameter and width compared to the other four tires.