I've not done any research yet, because I wanted to get an idea of the community's take on cold-weather tires. Are they necessary? Are they worth it to have another set of wheels? On my car I have my summer set and my winter set. Weather here can get down to below zero once in a great while, but mostly sits around the freezing or just below freezing during winter. I'm not necessarily planning on doing much riding in the colder weather, but if I do, I want to make sure I've got some good knowledge on tire set ups.