The phrase "over tires" is spelled using American English phonetic transcription as /oʊvər taɪ́rz/. The first syllable is pronounced with the diphthong "ow" sound, while the second syllable has a long "i" vowel sound. The "r" in "over" is pronounced with a slight emphasis, and the final syllable has a softer "z" sound. This phrase typically refers to something going on top of the tires on a vehicle, such as chains or protective covers.
There is no specific word "over tires" in the English language. It's possible that you may be referring to the phrase "spare tire" or "over-tire", which have different etymologies. Here's a brief explanation for both:
1. Spare Tire: The phrase "spare tire" is used to describe an extra tire that is carried in a vehicle for emergencies. The etymology can be traced back to the mid-19th century, where the term "spare" referred to something extra or additional. In this context, the word "spare" is used because it is not the primary or main tire on a vehicle, but rather a backup.
2. Over-Tire: If you are referring to the term "over-tire", it is not commonly used or recognized.