What is another word for cold rubber?
Pronunciation: [kˈə͡ʊld ɹˈʌbə] (IPA) 
Cold rubber is a term often used in the tire industry to describe a tire that has lost its flexibility and become hardened over time. However, there are several synonyms for cold rubber, which are commonly used to describe the condition of a tire. These include hardened, rigid, inflexible, toughened, and iced-over. Other synonyms that can be used to describe the same condition are solidified, congealed, crystallized, and stiffer, depending on the context. It is important to note that these synonyms may have slightly different nuances and can be used interchangeably depending on the speaker's preference.
