As per Tire Rack re cold storage of summer performance tires.
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Will prolonged cold weather storage affect summer tire compounds
View attachment 137077
View attachment 137078
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Yes, prolonged cold weather storage can significantly affect summer tire compounds. While simply storing them in the cold is less damaging than driving on them, temperatures consistently below
40°F (5°C), and particularly below
20°F (-7°C), can cause the specialized rubber to harden, become brittle, and potentially develop cracks.