I've driven them down to about 25 degrees on my z/28. The car is crazy loose below 50. Below 30 the z/28 will spin with traction control on. On track I can get heat into them in the 35 - 40 degree range but it takes a few laps. No damage from moving the car on them in cold weather.
I agree for you to have fun in the car 70 - 75 degrees and warm pavement will be the sweet spot.
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