Originally Posted by
illusiumd
Sorry - Chicago city streets - I usually only ride when plows/salt trucks have been out. So only snow/ice in patches and usually only above 20/30 F.
Ah.
That zone around 30°F is actually my least favorite for riding a bike, as the stuff on the ground could be dry and frozen, or wet and slick thanks to the salt. I pretty much stick to studs when any part of the forecast goes that low.
None of my road bikes will fit tires over 30mm, but if I had one with the clearance for it (and wanted to ride it all winter instead of the MTB with 1.95" studded tires

) I'd look into the 700x32 Nokian A10s, a little less than halfway down this page:
Studded Bicycle Tires