Apr 28, 2016 - 12:18 PM
in reply to jpswart82
Although I retired a while ago, I used to work in development of chemicals for use in tires and rubber. So i have some not-too-detailed knowledge of the subject. I did not work for a tire company, but they were our customers, so we had to understand their needs.
Such a limit might have been correct and appropriate 20 or 30 years ago, because using a rubber in the tread of a tire that gave good winter traction had the trade off that the tires wore out quickly when they got hot....as at high speeds in hot weather.
Over the past 20 years or so, advances in tire tread technology have allowed tires with good snow and ice traction that are durable under normal driving conditions all year round. There are still tread rubbers and tread designs that are specially made for winter use, but they can survive other seasons. The more common use of this technology is to develop so-called "all season" tires which are good but not the most extreme designs for winter traction and are comfortable with any climate conditions.
Just make sure that your tires are correctly inflated. When you drive on an under-inflated tire , especially at highway speeds, it can get so hot from excessive flexing that it will destroy itself.