Either, but it is easier to just buy studded tires. Make sure the studs are carbide or they'll wear out before the end of the season.
Oh, and...uh....err...you want to leave them on until the ice storms subside...I made the mistake of riding in with*out* studs yesterday. The weather was below freezing and it had rained the day before. I figured out all I had to do was avoid the puddles....didn't really think about the glaze on the road, not to mention the bridges...dumb, dumb. Stayed upright, but I should have had the studs.




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