RE92's are probably far worse in 2*C than the SO-3. Crappy A/S tires vs worn top-tier summer tires in 2*C. If the summer's had a chance to heat up they'd of course be better, straight out of the chute, I would have thought it'd be a toss up.
My experiences in the Miata with perf. A/S tires vs summers is that perf. A/S is as close to lying about a tire's abilities as you can do. A/S tires don't stick in the cold, the hot, or the wet - that's why I call them no-seasons. The Falkens (451) on the bimmer were getting pretty hard at 4*C when I took them off, but if I had been driving for 15ish minutes at speed they weren't too bad. The Dunlop M3's are blowing me away with their performance in the wet 2-6*C we've been having here. Very predictable, remarkably grippy, not too bad turn-in, and nicely quiet. A winner so far (not that they've seen ice or snow yet).
Back to lug nuts (bolts on German cars). Went and checked the 4 sets of lug bolts I have - 3 different sizes FYI.