I have these tires (M&G 160's 26x1.9) and have ridden them on icy snow-packed roads in Boulder for my commute. In my experience so far they are work decently well but are not miracle-workers on that old icy stuff underneath the snow. I white-knuckle it every time I feel the back tire slip around. Thankfully my commute involves mostly bike paths which better plowed than the roads so I only have to contend with about 2 miles of icy streets though part of that is on a fairly hairy hill when its iced up.
I have been running them at 40psi but I will try them out at 30psi to see if they work any better. I just dread the added rolling resistance this is going to add to an already slow tire. I weight about 185lbs so I think I am getting enough weight over the tires.
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2006SurlyCrosscheck]
1995KleinFervor
1993BstoneRB1
2007IROSSBFGS
1986PanasonicDX4000
2014E-JOE