I was riding to the library yesterday when my rear tire developed a bulge. Rather than ride 2-3 miles to a bike shop I pulled into Rite-Aid and bought a 20x2.15 Bell Platinum Series BMX Bike Tire with KEVLAR that was tightly folded up in a box for $17. It has "Kevlar Anti-Puncture Protection and a Carbon Steel Folding Bead". It must be steel cable to fold so tightly and spring back to shape with no kinks in the bead. Anyway, it doesn't have what I would call an aggressive tread and should work great in this winter weather. It looks like a nice "fresh" tire. While mounting the tire I noticed the screw holding the idler/tension arm cog was loose again. It almost fell out once before. I need to clean it and put LocTite on the threads.