I am amazed at how well knobbly tyres grip on the refrozen tracks in the woods near my house. The previous day I was sliding around on foot with 2 walking poles. As long as I hear that crackle under the tyres I know the bike will stay upright! What doesn't work though are the mileometers. I see the specification says from 0C to 55C so that is the reason I suppose as my bike shed has been around freezing and below for weeks now. I just hope rising temperatures sort that problem out. I find that only leather, padded, mitts keep my hands warm enough at these temperatures.