pilot a/s's are great tires for winter temps. i use them on my G....in fact, i put them on today. if you're driving in snow you should get snow tires. the pilots a/s wont do too well in snow.
you shouldn't be loosing too much grip from your RE050's at 60F. ive been driving my Z around 40F and the grip is still good. my S03's on the other hand, 45F was about the limit.
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