Originally Posted by
gerv
Well.. just keep in mind that studded tires are really great on ice, but not much help if there's snow on the ice. I have studded tires, but the studs themselves aren't always beneficial. For the road surface you are describing a really knobby MTB tire with low air pressure is about as good as it gets. Go slow, get ready to dismount if hit a snow drift and don't attempt any fancy maneuvers like trackstands or standing on the peddles.
Or, as I say above, get the bus
I've never tried it, but some people swear by skinny road bike tires for snow without ice. they say the tires cut through the snow and grip on the pavement underneath.
A couple times I've been out riding just after a moderate snowfall (5-6 inches) and I've followed the tracks of somebody around here who rides on skinny tires. the tracks were straight and steady so he or she was riding without skidding.