Summer Tires
Safety Car
Joined: Nov 2011
Posts: 3,715
Likes: 343
From: Norman OK
It really depends on the type of summer tire. I have driven on Michelin Cup2's when it was 20° outside from Green bay to Oklahoma, zero issues. I drive on my Continental Extreme Contact Sport tires year round as long as it isnt wet outside or snowing, I drive them down in the 20's as well.
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Joined: Mar 2001
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From: In a parallel universe. Currently own 2014 Stingray Coupe.
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It is the outside temp.
Drifting
Joined: Mar 2011
Posts: 1,252
Likes: 343
From: Louisville KY
That refers to the outside temp. The tires that came on my 2016 Stingray (as well as every other Stingray) were summer only tires. The grip was lessened quite a bit when temps got below 40 degrees. I just switched to Michelin AS/4 ZP tires last week.
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