Winter is my favorite time to ride. I run a set of Trelleborg (white stripe) Winter Friction tires. This will be the fourth season on them and I ride a lot. Mostly I abuse the tires on frozen ground (without snow). It's cheating, traction is so good. They are excellent in up to about 6 inches of snow. They seem very expensive but when you consider how long they last, the price is OK. Despite my abuse, I've only shed one stud so far.