[DGthe3]

Usually its recommended to go narrower for winter tires, not wider. This is to cut through the snow, rather than ride on top of it. Or at the very least, pack it into something more solid allowing for more bite. Reducing air pressure would make the tire more likely to 'float' on top of the snow, giving it less traction.

On ice or cold pavement, you'd still probably want to have your tires at 'normal' pressure. Thats where you're going to have optimal steering and braking. Remember: safe winter driving isn't about how quickly you can accelerate, its about how well you can avoid hitting things.