Hey tire experts out there, as many of you know, some of us *later* reservation holders are due for an early delivery. It now looks like I'll be getting my car (with the 21" summer tires) in December. Where I live, it doesn't snow very often (we have SUV's for that) but temps do regularly drop to around the freezing level. I am planning on getting an extra set of 19" w/Pirelli winter tires, but they're sold out right now. My question is this: Just what are the characteristics of the summer tires in these conditions. I've heard that at 40 degrees they basically turn to wood, but is this a hard line? what about 42 degrees? what about 37 degrees, but after I've driven on them for a few minutes (how long should they take to 'warm' up) How dangerous is it to drive in 'iffy' temps like this? Thanks for any info (or anecdotal information) folks might have.