Post by
Larz »
https://forums.nicoclub.com/larz-u216291.html
Wed Jul 01, 2015 10:11 am
From the Tire Rack website and Tire Manufacturer guidelines:
When faced with near- and below-freezing temperatures, drivers should leave their summer performance tire-equipped vehicle at home and drive a vehicle equipped with all-season or winter tires.
Summer performance tires feature tread compounds engineered to provide traction in warm to hot ambient temperatures. They were never intended to experience near- and below-freezing temperatures, nor the winter driving conditions that often accompany them.
As ambient temperatures get colder, typically in the 40-45° Fahrenheit range, summer performance tires lose a noticeable percentage of traction as their tread compound rubber properties change from a pliable elastic to inflexible plastic. The tire industry uses the term "glass transition" to describe the temperature where a summer performance tire's grip/slip performance changes dramatically. Fortunately, glass transition is a reversible condition that allows the tires' normal traction to return as the ambient temperatures climb.
If ambient temperatures drop to near- or below-freezing, driving a vehicle equipped with summer rated tires risks the possibility of tread compound cracking. The compounds in the sidewall and tread area can actually 'freeze' and crack or breakdown. Tread compound cracking and breakdown is a permanent condition that requires the tires to be replaced. The other condition that can be caused by running summer performance tires in cold temperatures is the possibility of chipping away the edges of the tread blocks.
Since both of these conditions only occur as the result of what's considered improper use or storage, they are not typically covered by the manufacturer's warranty nor car insurance companies when this leads to an accident or damage. Insurance companies 'could' site 'improper use of motor vehicle and deny all claims.