Mick F wrote:A tyre is a tyre when it comes to bicycles. I can understand the car analogy, but bike tyres are narrow and bikes go slow. I use the same tyres all year and never have a problem.
Reluctantly wheeling out the world's least popular analogy, that's a bit like saying you've never bumped your head therefore helmets don't work. It's a false syllogism.
If your tyres work well enough in winter for the way you ride then great. But that doesn't have any bearing on the matter of (a) whether some tyres grip better than yours in winter, or (b) whether some tyres grip well in summer but very poorly in winter, or (c) whether some tyres grip exceptionally well in the cold and wet but wear quickly or are draggy in summer.
The narrowness is relevant when it comes to cutting through standing water, but not to the mehcanical adhesion of the tyre and the road surface, which is all about the rubber compound and the ability of the surface of the tyre to push fine parts of its structure into the surface. (Think of dragster tyres and spiders' feet respectively.) The former is temperature dependent, though admittedly is probably the lesser of the two factors, and even though the temperature variation on a bicycle isn't anything like that for a racing car, it's still a factor.
Mick F wrote:I don't go out when it's icy and I don't go off road, but wet weather is the same as dry weather to my tyres no matter what temperature or season.
Pretty sure it can't be; wet gives less grip than dry, that's pretty unavoidable.