[Pete_vB]

First, expect compound to be changed per Chevy's specs, so you can't assume it's the same as every other Sport Cup 2. Second, you can work heat into the tire over time. Just driving down the highway at freeway speed will raise the temp perhaps 15 degrees, then once you start pushing it you'll build heat quickly. The skidpad is the best possible place to put heat in.

That said, it's been low 50s, occasionally low 40s in my area in the morning recently, and I pull car out of the garage to head to work every morning... with TC off. I can guarantee that at 43F I will spin the tires up in 2nd in a straight line when I floor it, quite possibly 3rd too. However if I was running a skidpad I'm sure I could work heat into them to get good grip. If it rains at that temperature, however, and you've got water cooling the tires... forget it.