It depends on just how packed down and travelled the snow is and where you’re riding. At least around here (Boston) when the bike paths are plowed they do one pass with a fairly high plow combined with lots of foot traffic so it ends up real slick, especially if there isn’t sun during the day. On that the studs help a lot, and despite having wheelsets with and without studs I just end up running studs from Dec-Mar. At least on my route to work there’s a few spots where black ice can sneak up on you.
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