Originally Posted by
zip439
From what I have learned of todays new summer tires it is okay to store most summer tires in cold temps, so long as they are warmed slowly, naturally back to above 40 before use. The rubber compounds can take the swing in temp and come back to their designed spec. How many times this can occur without some degrading I do not know. You loose performance/grip with most summer tire compounds when temps start getting below 40F.
At 40F they are not safe, poor grip means poor braking and spinning tires. Below 50F the tires I have start to get dodgy, the tires need to warm up and shortish trips at urban speeds do not get the job done as cold road surfaces keep the rubber temp down.