This is only part of the equation, the road/track temperature is more important than air temperature to select the correct tires.
As most of the roads are paved in asphalt in Canada, if there is sunlight available, they absorb a lot of heat during the day. Therefore, the air temperature may be 0 C or 2 C, but the road temperature could be as high as 5 C - 10 C.
Quote:
Originally Posted by spacedogg
According to BMW Canada...best time to put on winter tires is when average temperatures drop below 7 degrees celsius.
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